Ford Escape Manuals
Ford Escape 2020-2024 Service Manual / Electrical / Battery and Charging System / High Voltage Battery, Mounting and Cables / Diagnosis and Testing - High Voltage Battery, Mounting and Cables - Hybrid Electric Vehicle (HEV)

Ford Escape: High Voltage Battery, Mounting and Cables / Diagnosis and Testing - High Voltage Battery, Mounting and Cables - Hybrid Electric Vehicle (HEV)

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 450 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.


  Diagnostic Trouble Code Chart


Module   DTC Description Action
  BCMC P0CDF:00 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test H
  BCMC P0CE2:00 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test H
  BCMC P0CE3:00 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test H
  BECM B11D5:00 Restraint Event Notification: Vehicle Disabled: No Sub Type Information   GO to Pinpoint Test A
  BECM B11D8:11 Restraint Event Notification: Circuit Short to Ground   GO to Pinpoint Test B
  BECM B11D8:15 Restraint Event Notification: Circuit Short to Battery or Open   GO to Pinpoint Test C
  BECM B11D8:29 Restraint Event Notification: Signal Invalid   GO to Pinpoint Test D
  BECM B11D8:36 Restraint Event Notification: Signal Frequency Too Low   GO to Pinpoint Test D
  BECM B11D8:37 Restraint Event Notification: Signal Frequency Too High   GO to Pinpoint Test D
  BECM B11D8:38 Restraint Event Notification: Signal Frequency Incorrect   GO to Pinpoint Test D
  BECM P05CB:00 Vehicle Hardware Incompatibility: No Sub Type Information   GO to Pinpoint Test E
  BECM P0563:00 System Voltage High: No Sub Type Information   GO to Pinpoint Test Q
  BECM P062F:00 Internal Control Module EEPROM Error: No Sub Type Information   GO to Pinpoint Test F
  BECM P0A06:00 Motor Electronics Coolant Pump "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test G
  BECM P0A07:00 Motor Electronics Coolant Pump Control Circuit High: No Sub Type Information   GO to Pinpoint Test G
  BECM P0A0A:00 High Voltage System Interlock Circuit "A": No Sub Type Information   GO to Pinpoint Test I
  BECM P0A0C:00 High Voltage System Interlock Circuit "A" Low: No Sub Type Information   GO to Pinpoint Test I
  BECM P0A7D:00 Hybrid Battery Pack State Of Charge Low: No Sub Type Information   GO to Pinpoint Test M
  BECM P0A7E:00 Hybrid/EV Battery Pack Over Temperature: No Sub Type Information   GO to Pinpoint Test K
  BECM P0A7F:00 Hybrid/EV Battery Pack "A" Deterioration: No Sub Type Information   GO to Pinpoint Test L
  BECM P0A9C:00 Hybrid/EV Battery Temperature Sensor "A" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test O
  BECM P0A9D:00 Hybrid Battery Temperature Sensor A Circuit Low: No Sub Type Information   GO to Pinpoint Test O
  BECM P0A9E:00 Hybrid Battery Temperature Sensor A Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0AA1:00 Hybrid Battery Positive Contactor Circuit Stuck Closed: No Sub Type Information   GO to Pinpoint Test Q
  BECM P0AA2:00 Hybrid Battery Positive Contactor Circuit Stuck Open: No Sub Type Information   GO to Pinpoint Test Q
  BECM P0AA4:00 Hybrid Battery Negative Contactor Circuit Stuck Closed: No Sub Type Information   GO to Pinpoint Test R
  BECM P0AA5:00 Hybrid Battery Negative Contactor Circuit Stuck Open: No Sub Type Information   GO to Pinpoint Test R
  BECM P0AA6:00 Hybrid Battery Voltage System Isolation Fault: No Sub Type Information   GO to Pinpoint Test S
  BECM P0AA7:00 Hybrid/EV Battery Voltage Isolation Sensor Circuit: No Sub Type Information   GO to Pinpoint Test T
  BECM P0ABB:00 Hybrid/EV Battery Pack Voltage Sense "A" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test V
  BECM P0ABC:00 Hybrid Battery Pack Voltage Sense A Circuit Low: No Sub Type Information   GO to Pinpoint Test V
  BECM P0ABD:00 Hybrid Battery Pack Voltage Sense A Circuit High: No Sub Type Information   GO to Pinpoint Test V
  BECM P0AC0:00 Hybrid Battery Pack Current Sensor A Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test W
  BECM P0AC1:00 Hybrid Battery Pack Current Sensor A Circuit Low: No Sub Type Information   GO to Pinpoint Test W
  BECM P0AC2:00 Hybrid/EV Battery Pack Current Sensor "A" Circuit High: No Sub Type Information   GO to Pinpoint Test W
  BECM P0AC3:00 Hybrid/EV Battery Pack Current Sensor "A" Circuit Intermittent/Erratic: No Sub Type Information   GO to Pinpoint Test W
  BECM P0AC6:00 Hybrid/EV Battery Temperature Sensor B Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test O
  BECM P0AC7:00 Hybrid Battery Temperature Sensor B Circuit Low: No Sub Type Information   GO to Pinpoint Test O
  BECM P0AC8:00 Hybrid Battery Temperature Sensor B Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0ACB:00 Hybrid/EV Battery Temperature Sensor C Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test O
  BECM P0ACC:00 Hybrid Battery Temperature Sensor C Circuit Low: No Sub Type Information   GO to Pinpoint Test O
  BECM P0ACD:00 Hybrid Battery Temperature Sensor C Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0AD9:00 Hybrid Battery Positive Contactor Control Circuit Open/GM: No Sub Type Information   GO to Pinpoint Test X
  BECM P0ADB:00 Hybrid/EV Battery Positive Contactor Control Circuit Low: No Sub Type Information   GO to Pinpoint Test X
  BECM P0ADC:00 Hybrid Battery Positive Contactor Control Circuit High: No Sub Type Information   GO to Pinpoint Test X
  BECM P0ADD:00 Hybrid/EV Battery Negative Contactor Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test Y
  BECM P0ADF:00 Hybrid/EV Battery Negative Contactor Control Circuit Low: No Sub Type Information   GO to Pinpoint Test Y
  BECM P0AE0:00 Hybrid Battery Negative Contactor Control Circuit High: No Sub Type Information   GO to Pinpoint Test Y
  BECM P0AE4:00 Hybrid/EV Battery Precharge Contactor Control Circuit "A" Open: No Sub Type Information   GO to Pinpoint Test AA
  BECM P0AE6:00 Hybrid/EV Battery Precharge Contactor Control Circuit "A" Low: No Sub Type Information   GO to Pinpoint Test AA
  BECM P0AE7:00 Hybrid/EV Battery Precharge Contactor Control Circuit "A" High: No Sub Type Information   GO to Pinpoint Test AA
  BECM P0AE9:00 Hybrid/EV Battery Temperature Sensor D Circuit Range/Performance: No Sup Type Information   GO to Pinpoint Test O
  BECM P0AEA:00 Hybrid Battery Temperature Sensor D Circuit Low: No Sup Type Information   GO to Pinpoint Test O
  BECM P0AEB:00 Hybrid Battery Temperature Sensor D Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0AFB:00 Hybrid Battery System Voltage High: No Sub Type Information   GO to Pinpoint Test AB
  BECM P0AFD:00 Hybrid Battery Pack Temperature Too Low: No Sub Type Information   GO to Pinpoint Test AC
  BECM P0B24:00 Hybrid Battery A Voltage Unstable: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0B3B:00 Hybrid/EV Battery Voltage Sense "A" Circuit: No Sub Type Information   GO to Pinpoint Test AD
  BECM P0B40:00 Hybrid/EV Battery Voltage Sense "B" Circuit: No Sub Type Information   GO to Pinpoint Test AD
  BECM P0B45:00 Hybrid/EV Battery Voltage Sense "C" Circuit: No Sub Type Information   GO to Pinpoint Test AD
  BECM P0B4A:00 Hybrid/EV Battery Voltage Sense "D" Circuit: No Sub Type Information   GO to Pinpoint Test AD
  BECM P0B4F:00 Hybrid/EV Battery Voltage Sense "E" Circuit: No Sub Type Information   GO to Pinpoint Test AD
  BECM P0BB3:00 Hybrid/EV Battery Voltage Sense "Y" Circuit: No Sub Type Information   GO to Pinpoint Test AE
  BECM P0BB4:00 Hybrid/EV Battery Voltage Sense "Y" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test AE
  BECM P0BB8:00 Hybrid/EV Battery Voltage Sense "Z" Circuit: No Sub Type Information   GO to Pinpoint Test AE
  BECM P0BC3:00 Hybrid/EV Battery Temperature Sensor E Circuit Range/Performance: No Sup Type Information   GO to Pinpoint Test O
  BECM P0BC4:00 Hybrid Battery Temperature Sensor E Circuit Low: No Sup Type Information   GO to Pinpoint Test O
  BECM P0BC5:00 Hybrid Battery Temperature Sensor E Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0C30:00 Hybrid/EV Battery Pack State of Charge High: No Sub Type Information   GO to Pinpoint Test AB
  BECM P0C34:00 Hybrid/EV Battery Temperature Sensor F Circuit Range/Performance: No Sup Type Information   GO to Pinpoint Test O
  BECM P0C35:00 Hybrid Battery Temperature Sensor F Circuit Low: No Sup Type Information   GO to Pinpoint Test O
  BECM P0C36:00 Hybrid Battery Temperature Sensor F Circuit High: No Sub Type Information   GO to Pinpoint Test O
  BECM P0C43:00 Hybrid/EV Battery Pack Coolant Temperature Sensor "A" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test U
  BECM P0C44:00 Hybrid/EV Battery Pack Coolant Temperature Sensor "A" Circuit Low: No Sub Type Information   GO to Pinpoint Test U
  BECM P0C45:00 Hybrid/EV Battery Pack Coolant Temperature Sensor "A" Circuit High: No Sub Type Information   GO to Pinpoint Test U
  BECM P0C48:00 Hybrid/EV Battery Pack Coolant Pump "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0C49:00 Hybrid/EV Battery Pack Coolant Pump "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0C4A:00 Hybrid/EV Battery Pack Coolant Pump "A" Control Performance: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0C4B:00 Hybrid/EV Battery Pack Coolant Pump "A" Supply Voltage Circuit/Open: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0C73:00 Motor Electronics Coolant Pump "A" Control Performance: No Sub Type Information   GO to Pinpoint Test G
  BECM P0C78:00 Hybrid/EV Battery System Precharge Time Too Long: No Sub Type Information   GO to Pinpoint Test Z
  BECM P0CFF:00 Hybrid/EV Battery Pack Coolant Pump "A" Stuck/Stalled: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0DAD:00 Hybrid/EV Battery Cell Balancing Circuit "A" Stuck On: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DAE:00 Hybrid/EV Battery Cell Balancing Circuit "A" Stuck Off: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DB1:00 Hybrid/EV Battery Cell Balancing Circuit "B" Stuck On: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DB2:00 Hybrid/EV Battery Cell Balancing Circuit "B" Stuck Off: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DB5:00 Hybrid/EV Battery Cell Balancing Circuit "C" Stuck On: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DB6:00 Hybrid/EV Battery Cell Balancing Circuit "C" Stuck Off: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DB9:00 Hybrid/EV Battery Cell Balancing Circuit "D" Stuck On: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DBA:00 Hybrid/EV Battery Cell Balancing Circuit "D" Stuck Off: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DBD:00 Hybrid/EV Battery Cell Balancing Circuit "E" Stuck On: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DBE:00 Hybrid/EV Battery Cell Balancing Circuit "E" Stuck Off: No Sub Type Information   GO to Pinpoint Test AJ
  BECM P0DE6:00 Hybrid/EV Battery Pack Cell Voltage Low: No Sub Type Information   GO to Pinpoint Test M
  BECM P0E1F:00 Hybrid/EV Battery Pack Coolant Pump "A" Control Circuit Driver Current/Temperature Too High: No Sub Type Information   GO to Pinpoint Test AH
  BECM P0ECA:00 Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation: No Sub Type Information   GO to Pinpoint Test O
  BECM P1A0F:68 Hybrid Powertrain Control Module - Vehicle Disabled: Event Information   GO to Pinpoint Test P
  BECM P1A1E:66 Hybrid/EV Battery Contactor Control Signal: Signal Has Too Many Transitions / Events   GO to Pinpoint Test J
  BECM P262B:00 Control Module Power Off Timer Performance: No Sub Type Information   GO to Pinpoint Test AI
  BECM P2B29:00 Hybrid/EV Battery Pack Coolant Pump "A" Overspeed /Air in System: No Sub Type Information   GO to Pinpoint Test AH
  BECM P2C89:00 Hybrid/EV Battery System Precharge Current Too High: No Sub Type Information   GO to Pinpoint Test Z
  BECM P2CF3:00 Hybrid/EV Battery Pack Coolant Pump "A" Underspeed: No Sub Type Information   GO to Pinpoint Test AH
  BECM P2D00:00 Motor Electronics Coolant Pump "A" Stuck/Stalled: No Sub Type Information   GO to Pinpoint Test G
  BECM P2D01:00 Motor Electronics Coolant Pump "A" Overspeed/Air in System: No Sub Type Information   GO to Pinpoint Test G
  BECM P2D02:00 Motor Electronics Coolant Pump "A" Underspeed: No Sub Type Information   GO to Pinpoint Test G
  BECM P2D03:00 Motor Electronics Coolant Pump "A" Supply Voltage Circuit: No Sub Type Information   GO to Pinpoint Test G
  BECM P2D04:00 Motor Electronics Coolant Pump "A" Control Module Overtemperature: No Sub Type Information   GO to Pinpoint Test G
  BECM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information   GO to Pinpoint Test AL
  BECM U0140:00 Lost Communication With Body Control Module "A": No Sub Type Information   GO to Pinpoint Test AM
  BECM U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information   GO to Pinpoint Test AN
  BECM U0293:00 Lost Communication with Hybrid/EV Powertrain Control Module: No Sub Type Information   GO to Pinpoint Test AO
  BECM U0298:00 Lost Communication With DC to DC Converter Control Module "A": No Sub Type Information   GO to Pinpoint Test AP
  BECM U0300:00 Internal Control Module Software Incompatibility: No Sub Type Information   GO to Pinpoint Test AQ
  BECM U0431:00 Invalid Data Received From Body Control Module "A": No Sub Type Information   GO to Pinpoint Test AR
  BECM U0452:00 Invalid Data Received From Restraints Control Module: No Sub Type Information   GO to Pinpoint Test AS
  BECM U0594:00 Invalid Data Received From Hybrid/EV Powertrain Control Module: No Sub Type Information   GO to Pinpoint Test AT
  BECM U0599:00 Invalid Data Received From DC/DC Converter Control Module "A": No Sub Type Information   GO to Pinpoint Test AU
  BECM U1030:00 Software Incompatibility With Hybrid/EV Battery: No Sub Type Information   GO to Pinpoint Test AV
  BECM U3000:04 Control Module: System Internal Failure   GO to Pinpoint Test AW
  BECM U3000:49 Control Module: Internal Electronic Failure   GO to Pinpoint Test AW
  BECM U3003:16 Battery Voltage: Circuit Voltage Below Threshold   GO to Pinpoint Test AK
  BECM U3003:17 Battery Voltage: Circuit Voltage Above Threshold   GO to Pinpoint Test AK
  BECM U3003:64 Battery Voltage: Signal Plausibility Failure   GO to Pinpoint Test AK
  BECM U3012:00 Control Module Improper Wake-up Performance: No Sub Type Information   GO to Pinpoint Test AF
  BECM U301B:00 Control Module Wake-up Circuit "A" Low: No Sub Type Information   GO to Pinpoint Test AG
  BECM U301C:00 Control Module Wake-up Circuit "A" High: No Sub Type Information   GO to Pinpoint Test AG
  BECM U3517:00 High Voltage System Interlock Circuit "C" Low: Circuit Open   GO to Pinpoint Test I
  SOBDMC P0A0A:13 High Voltage System Interlock Circuit "A": Circuit Open  
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
  SOBDMC P0CDF:00 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test H
  SOBDMC P0CE2:00 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test H
  SOBDMC P0CE3:12 Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test H
  SOBDMC P0DA8:00 Hybrid/EV Battery Voltage/Drive Motor "A" Inverter Voltage Correlation: No Sub Type Information  
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
  SOBDMC P1A44:00 A/C Disabled – Hybrid/EV Battery Overtemperature: No Sub Type Information   GO to Pinpoint Test K
  SOBDMC P2D40:00 Hybrid/EV Battery Cooling System "C" Performance: No Sub Type Information   GO to Pinpoint Test N
  SOBDMC U351B:00 High Voltage System Interlock Circuit "A": Circuit Open  
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).

Pinpoint Tests


PINPOINT TEST A: B11D5:00

Refer to Wiring Diagrams Cell 46 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors the impact notification output from the RCM . The RCM outputs a PWM voltage on the circuit based on status. If an fuel cutoff/crash event is indicated, the BECM will initiate shutdown of the high voltage battery system.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM B11D5:00 Restraints Event - Vehicle Disabled: No Sub Type Information This DTC indicates the RCM is outputting a fuel cutoff/crash event.

Possible Sources

  • RCM
A1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D5:00 present?
Yes RETRIEVE Diagnostic Trouble Codes (DTCs) from the RCM and BCM .
REFER to: Airbag Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing).
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No ADDRESS all other BECM Diagnostic Trouble Codes (DTCs). REFER to the DTC chart in this section. If no other BECM Diagnostic Trouble Codes (DTCs) are present the concern is not present at this time.

PINPOINT TEST B: B11D8:11

Refer to Wiring Diagrams Cell 46 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors the impact notification output from the RCM . The RCM outputs a PWM voltage on the circuit based on status. If an event is indicated, the BECM will initiate shutdown of the high voltage battery system. If the BECM senses a fault on the circuit, it will illuminate the powertrain malfunction (wrench) indicator and set a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM B11D8:11 Restraint Event Notification: Circuit Short To Ground Sets when BECM detects a short to ground on the event notification signal circuit for 10 seconds or more.

Possible Sources

  • Wiring, terminals or connectors
  • BCM
  • RCM
  • BECM
  • PCM

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:11 present?
Yes GO to B2
No The concern is not present at this time.

B2 CHECK THE EVENT NOTIFICATION SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Ignition OFF.
  • Depower the SRS .
    REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect RCM C310A and C310B .
  • Disconnect High Voltage Battery C3733 .
  • Disconnect PCM C1381B .
  • Disconnect BCM C2280F .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-2 (female side)   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B3
No REPAIR the circuit.

B3 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE BCM (BODY CONTROL MODULE) DISCONNECTED
  • Connect RCM C310A and C310B .
  • Connect High Voltage Battery C3733 .
  • Connect PCM C1381B .
  • Repower the SRS . Do not prove out the SRS at this time.
    REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:11 retrieved?
Yes GO to B4
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in Section 419-10.

B4 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE RCM (RESTRAINTS CONTROL MODULE) DISCONNECTED
  • Ignition OFF.
  • Depower the SRS .
    REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect RCM C310B .
  • Repower the SRS . Do not prove out the SRS at this time.
    REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:11 retrieved?
Yes GO to B5
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

B5 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED
  • Ignition OFF.
  • Disconnect PCM C1381B .
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:11 retrieved?
Yes GO to B6
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)

B6 CHECK THE EVENT NOTIFICATION SIGNAL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR A SHORT TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237A-17 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to B7
No INSTALL a new wiring harness.

B7 CHECK THE EVENT NOTIFICATION SIGNAL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-2 (male side)   C4237A-17

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness.

PINPOINT TEST C: B11D8:15

Refer to Wiring Diagrams Cell 46 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors the impact notification output from the RCM . The RCM outputs a PWM voltage on the circuit based on status. If an impact notification is indicated, the BECM will initiate shutdown of the high voltage battery system. If the BECM senses a fault on the circuit, it will illuminate the powertrain malfunction (wrench) indicator and set a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM B11D8:15 Restraint Event Notification: Circuit Short To Battery Or Open Sets when BECM detects an open or short to voltage on the event notification signal circuit for 10 seconds or more

Possible Sources

  • Wiring, terminals or connectors
  • BCM
  • RCM
  • BECM
  • PCM

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:15 present?
Yes GO to C3
No The concern is not present at this time.

C2 CHECK CIRCUIT FOR SHORT TO VOLTAGE
  • Ignition OFF.
  • Depower the SRS .
    REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect RCM C310A and C310B .
  • Disconnect High Voltage Battery C3733 .
  • Disconnect PCM C1381B .
  • Disconnect BCM C2280F .
  • Ignition ON.

Click to display connectors
Positive Lead Measurement / Action Negative Lead
C3733-2 (female side)   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to C3

C3 CHECK THE EVENT NOTIFICATION SIGNAL CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-2 (female side)   C310B-42

Is the resistance less than 3 ohms?
Yes GO to C4
No REPAIR the circuit

C4 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE BCM (BODY CONTROL MODULE) DISCONNECTED
  • Connect RCM C310A and C310B .
  • Connect High Voltage Battery C3733 .
  • Connect PCM C1381B .
  • Repower the SRS . Do not prove out the SRS at this time.
    REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:15 retrieved?
Yes GO to C5
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in Section 419-10.

C5 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE RCM (RESTRAINTS CONTROL MODULE) DISCONNECTED
  • Depower the SRS .
    REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect RCM C310A and C310B .
  • Repower the SRS . Do not prove out the SRS at this time.
    REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:15 retrieved?
Yes GO to C6
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

C6 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED
  • Ignition OFF.
  • Disconnect PCM C1381B .
  • Repower the SRS . Do not prove out the SRS at this time.
    REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:15 retrieved?
Yes GO to C7
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)

C7 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS WITH RCM (RESTRAINTS CONTROL MODULE) GROUNDED
  • Ignition OFF.
  • Connect a 5A fused jumper between:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C310B-42   Ground
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • NOTE: When retrieving Diagnostic Trouble Codes (DTCs) with RCM C310B-42 shorted to ground, DTC B11D8:36 and B11D8:11 would normally be present. Using a diagnostic scan tool, perform BECM self-test.

Does DTC B11D8:15 appear?
Yes GO to C8
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

C8 CHECK THE ENS CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR AN OPEN
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-2 (male side)   C4237A-17

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness.

PINPOINT TEST D: B11D8:29, B11D8:36, B11D8:37, B11D8:38

Refer to Wiring Diagrams Cell 46 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors the impact notification output from the RCM . The RCM outputs a PWM voltage on the circuit based on status. If the BECM senses the frequency is out of range, will illuminate the powertrain malfunction (wrench) indicator and set a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM B11D8:29 Restraint Event Notification: Signal Invalid Sets in the BECM when the restraint event notification signal frequency cannot be determined.
BECM B11D8:36 Restraint Event Notification: Signal Frequency Too Low Sets in the BECM when the restraint event notification signal frequency is less than 9Hz.
BECM B11D8:37 Restraint Event Notification: Signal Frequency Too High Sets in the BECM when the restraint event notification signal frequency is greater than 550Hz for 10 seconds.
BECM B11D8:38 Restraint Event Notification: Signal Frequency Incorrect Sets in the BECM when the restraint event notification signal frequency is in the valid range (10-500 Hz) but not a valid state/pattern.

Possible Sources

  • RCM
  • BECM

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC B11D8:11, B11D8:15, B11D8:29, B11D8:36, B11D8:37, and/or B11D8:38 present?
Yes For DTC B11D8:11, GO to Pinpoint Test B
For DTC B11D8:15, GO to Pinpoint Test C
For DTC B11D8:29, B11D8:36, B11D8:37, and/or B11D8:38, GO to D2
No The concern is not present at this time.

D2 CHECK THE EVENT NOTIFICATION SIGNAL FREQUENCY
  • Ignition OFF.
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3733-2   Ground

Is the frequency between 9 - 11Hz?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

PINPOINT TEST E: P05CB:00

Normal Operation and Fault Conditions

The BECM monitors vehicle HS-CAN messages. If the BECM receives a HS CAN that is not does not identify with the correct vehicle type a vehicle hardware incompatibility fault DTC will set. The BECM will limit vehicle power and the powertrain malfunction (wrench) indicator will illuminate when the fault condition is present.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P05CB:00 Vehicle Hardware Incompatibility: No Sub Type Information This DTC sets if BECM receives a HS CAN that is not does not identify with the correct vehicle type.

Possible Sources

  • BECM software
  • BECM
E1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P05CB:00 present?
Yes CARRY OUT PMI on the BECM .
REFER to: Module Programming (418-01 Module Configuration, General Procedures).
If the concern is still present, CHECK OASIS to determine if a recent module replacement that includes the BECM or high voltage battery was recently performed. If so using a diagnostic check the module part number and determine if it is correct for the vehicle application.
No The concern is not present at this time.

PINPOINT TEST F: P062F:00

Normal Operation and Fault Conditions

The BECM reads and writes data to the EEPROM. If the BECM detects an EEPROM read/write error DTC will set. The BECM will illuminate the powertrain malfunction (wrench) indicator and MIL when the fault condition is present. The failure will cause the BECM to use default calibration values.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P062F:00 Internal Control Module EEPROM Error: No Sub Type Information This DTC sets if BECM detects an EEPROM malfunction detected. Can be read/write error, checksum error, etc.

Possible Sources

  • BECM
F1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P062F:00 present?
Yes CARRY OUT PMI on the BECM .
REFER to: Module Programming (418-01 Module Configuration, General Procedures).
If the concern is still present, CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern is not present at this time.

PINPOINT TEST G: P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, P2D04:00

Refer to Wiring Diagrams Cell 21 for schematic and connector information.

Normal Operation and Fault Conditions

The motor electronics coolant pump is an electric coolant pump is controlled by the BECM and circulates coolant through the Direct Current/Direct Current (DC/DC) converter control module and the SOBDMC also known as the Inverter System Controller (ISC). The BECM monitors the electric water pump and circuits for faults setting a DTC . The following Diagnostic Trouble Codes (DTCs) will illuminate the MIL .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A06:00 Motor Electronics Coolant Pump 'A' Control Circuit Low: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the control circuit is open or shorted to ground.
BECM P0A07:00 Motor Electronics Coolant Pump Control Circuit High: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the control circuit is shorted to 12-volt battery.
BECM P0C73:00 Motor Electronics Coolant Pump 'A' Control Performance: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates lost communication with the pump.
BECM P2D00:00 Motor Electronics Coolant Pump 'A' Stuck/Stalled: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the coolant pump motor stuck/stalled fault has occurred.
BECM P2D01:00 Motor Electronics Coolant Pump 'A' Overspeed/Air in System: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the coolant pump dry-run error has occurred.
BECM P2D02:00 Motor Electronics Coolant Pump 'A' Underspeed: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the coolant pump impeller speed below minimum speed error has occurred.
BECM P2D03:00 Motor Electronics Coolant Pump 'A' Supply Voltage Circuit: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the coolant pump power supply is under/overvoltage.
BECM P2D04:00 Motor Electronics Coolant Pump 'A' Control Module Overtemperature: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the motor electronics coolant pump indicates the coolant pump over temperature or internal error has occurred.

Possible Sources

  • Wiring, terminals or connectors
  • Low coolant level or air in the coolant system
  • Motor electronics coolant pump
  • BCMC
  • BECM
G1 ACTIVE COMMAND THE COOLANT PUMP AND PERFORM THE BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.
  • RECORD the Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_B_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration if the affected coolant pump is accessible.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U3012:00, P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, and/or P2D04:00 present, or is the coolant pump not running?
Yes For DTC U3012:00, GO to Pinpoint Test AF For DTC P2D01:00, GO to G2 For Diagnostic Trouble Codes (DTCs) P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D02:00, P2D03:00 or if the coolant pump is not running, GO to G4 For Diagnostic Trouble Codes (DTCs) P2D04:00, INSTALL a new motor electronics coolant pump.
REFER to: Electric Motor Electronics Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to G14
No CHECK for an intermittent fault condition. GO to G17

G2 CHECK THE ELECTRIC POWERTRAIN COOLING SYSTEM COOLANT LEVEL
  • Park the vehicle on a level surface and allow to cool to ambient temperature.
  • Visually inspect the electric powertrain cooling system coolant level.

Is the electric powertrain coolant level within specifications?
Yes GO to G3
No MEASURE and RECORD the coolant level from the MIN line. ADJUST the electric powertrain coolant level as necessary. Pressure test the engine cooling system and address any coolant leaks.
REFER to: Electric Powertrain Cooling (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Diagnosis and Testing).
GO to G3

G3 PERFORM THE COOLING SYSTEM FILL ROUTINE
  • Ignition ON.
  • CONNECT the diagnostic tool.
  • Using a diagnostic scan tool, perform the cooling system fill routine and verify if the affected coolant pump is running by feeling the pump for vibration.
    REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03C Engine Cooling, General Procedures).
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_B_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration if the affected coolant pump is accessible.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, and/or P2D04:00 present, or is the coolant pump not running?
Yes For Diagnostic Trouble Codes (DTCs) P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D02:00, P2D03:00 or if the coolant pump is not running, GO to G4 For DTC P2D01:00, REPEAT pinpoint test G3, if the DTC is still present, INSTALL a new motor electronics coolant pump.
REFER to: Electric Motor Electronics Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to G14 For DTC P2D04:00, INSTALL a new motor electronics coolant pump.
REFER to: Electric Motor Electronics Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to G14
No The repair is complete.

G4 CHECK THE MOTOR ELECTRONICS COOLANT PUMP AND HIGH VOLTAGE BATTERY ELECTRICAL CONNECTORS
  • Disconnect Motor Electronics Coolant Pump C1812 .
  • Disconnect High Voltage Battery C3733 .
  • Inspect for:
    • corrosion
    • damaged or bent pins
    • pushed-out pins

Are any concerns present?
Yes REPAIR the wiring and/or connector concern. Clear the BECM DTC's. Repeat the self-test.
No GO to G5

G5 CHECK THE MOTOR ELECTRONICS COOLANT PUMP B+ CIRCUIT
  • Disconnect Motor Electronics Coolant Pump C1812 .
  • Ignition ON.
  • Measure and record:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    12V BATTERY POST (B+) 12V BATTERY POST (B˗)
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-2   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery?
Yes GO to G8
No GO to G6

G6 CHECK THE MOTOR ELECTRONICS COOLANT PUMP B+ CIRCUIT FOR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BCMC C1002 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to G7
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

G7 CHECK THE MOTOR ELECTRONICS COOLANT PUMP B+ CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-2   C1002-15

Is resistance less than 3 ohms?
Yes INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
Clear the BECM DTC's. Repeat the self-test
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

G8 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CHASSIS GROUND AND CIRCUIT
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-1 12V BATTERY POST (B+)

Is voltage within 0.5V of the voltage measured at the 12V battery?
Yes GO to G9
No Remove G107 and clean mounting surface. Reinstall the ground bolt and repeat the test step. If the concern remains REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

G9 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-3   Ground

Is there any voltage present?
Yes REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.
No GO to G10

G10 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-3   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to G11
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

G11 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CONTROL CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-3 C3733-9 (female side)

Is the resistance less than 3 ohms?
Yes GO to G12
No REPAIR the circuit in question. Clear the BECM DTC's. Repeat the self-test.

G12 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1812-1   C1812-2
      C1812-1   C1812-3
      C1812-2   C1812-3

Is the resistance greater than 10,000 ohms?
Yes GO to G13
No REPAIR the circuits. Clear the BECM DTC's. Repeat the self-test.

G13 LOAD TEST THE MOTOR ELECTRONICS COOLANT PUMP B+ CIRCUIT
  • Ignition ON.
  • Measure:
    Click to display connectors

    NOTE: The use of a 1157 bulb or equivalent incandescent test lamp rated for 1A of current is required for this test.


    Positive Lead Measurement / Action Negative Lead
      C1812-2 12V BATTERY POST (B˗)

Does the light bulb illuminate brightly?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new motor electronics coolant pump.
REFER to: Electric Motor Electronics Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to G14
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
Clear the BECM DTC's. GO to G14

G14 ACTIVE COMMAND THE COOLANT PUMP ON AND REPEAT BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_B_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, and/or P2D04:00 present, or is the coolant pump not running?
Yes GO to G15
No The vehicle concern has been repaired.

G15 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CONTROL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR A SHORT TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237A-15 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to G16
No INSTALL a new wiring harness. Repower the high voltage system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Clear the BECM DTC's. Repeat the self-test.

G16 CHECK THE MOTOR ELECTRONICS COOLANT PUMP CONTROL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-15 C3733-9 (male side)

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness. Repower the high voltage system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Clear the BECM DTC's. Repeat the self-test.

G17 ACTIVE COMMAND THE COOLANT PUMP ON AND MONITOR THE COOLANT PUMP STATUS
  • Access the  BECM  and control the  COOL_PMP_B_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100%.
  • Access the  BECM  and monitor the  COOL_PMP_B_STAT  PID

  • With the help of an assistant, perform a wiggle test on the coolant pump wiring harness while monitoring the coolant pump status PID .

Did the coolant pump status PID change to a fault status during the wiggle test?
Yes REPAIR the wiring and/or connector concern. Clear the BECM DTC's. Repeat the self-test.
No The concern is not present at this time.

PINPOINT TEST H: P0CDF:00, P0CE2:00, P0CE3:00, P0CE3:12

Refer to Wiring Diagrams Cell 21 for schematic and connector information.

Normal Operation and Fault Conditions

The electric powertrain cooling system incorporates a high voltage battery coolant diverter valve. This valve opens/closes to bypass or allow the coolant flow through the high voltage battery coolant cooler. The high voltage battery coolant cooler cools the coolant using the HVAC system that provides additional cooling to the high voltage battery when needed. The coolant valve is controlled by the BCMC via internal relay. The BCMC monitors the coolant valve for electrical faults and sets an appropriate DTC . The SOBDMC also known as the Inverter System Controller (ISC) sends a message over the HS-CAN to request the BCMC to open or close the valve. The BCMC and SOBDMC set DTC P0CDF:00, P0CD2:00, P0CE3:00 and/or P0CE3:12.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BCMC P0CDF:00 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit/Open: No Sub Type Information The BCMC monitors the High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit for being open. The test fails if the voltage indicates open circuit exists for a calibrated amount of time.
SOBDMC P0CDF:00 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit/Open: No Sub Type Information The SOBDMC receives a HS-CAN message from the BCMC that indicates High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit is open.
BCMC P0CE2:00 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit Low: No Sub Type Information The BCMC monitors the High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit for low voltage. The test fails if the voltage exceeds a calibrated limit for a calibrated amount of time.
SOBDMC P0CE2:00 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit Low: No Sub Type Information The SOBDMC receives a HS-CAN message from the BCMC that indicates High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit voltage is low.
BCMC P0CE3:00 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit High: No Sub Type Information The BCMC monitors the High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit for high voltage. The test fails if the voltage exceeds a calibrated limit for a calibrated amount of time.
SOBDMC P0CE3:12 Hybrid/EV Battery Pack Coolant Control Valve 'A' Control Circuit High: Circuit Short To Battery The SOBDMC receives a HS-CAN message from the BCMC that indicates High Voltage Battery Coolant Control Valve "A" Control Circuit/Open circuit voltage is high.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery coolant diverter valve
  • BCMC
H1 CLEAR BCMC (BODY CONTROL MODULE C) AND SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS AND REPEAT SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BCMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, clear the SOBDMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform SOBDMC self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0CDF:00, P0CE2:00, and/or P0CE3:12 present?
Yes GO to H3
No GO to H2

H2 PERFORM A WIGGLE TEST ON THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE WIRING
  • Ignition ON.
  • Access the  SOBDMC  and control the  HYBATP_CCV_A  PID

    and active command the parameter to 100%.
  • Perform a wiggle test the wiring to the high voltage battery coolant diverter valve.
  • Using a diagnostic scan tool, perform SOBDMC self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0CDF:00, P0CE2:00, and/or P0CE3:12 present?
Yes GO to H3
No The concern is not present at this time.

H3 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE CONNECTOR FOR BEING FULLY SEATED
  • Check the high voltage battery coolant diverter valve C1955 for being fully seated.

Were any concerns found?
Yes Reseat the connector. Using a diagnostic scan tool, clear Continuous Memory Diagnostic Trouble Codes (CMDTCs) and repeat the SOBDMC self-test. If the DTC is still present, GO to H4
No GO to H4

H4 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE RESISTANCE

NOTE: The resistance specification below is for a temperature range between -40°C - 120°C (-40°F - 248°F)

  • Disconnect High Voltage Battery Coolant Diverter Valve C1955 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    pin 1 (component side) pin 2 (component side)

Is the resistance between 11 - 19 ohms?
Yes GO to H5
No INSTALL a new high voltage battery coolant diverter valve.
REFER to: High Voltage Battery Coolant Diverter Valve (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC self-test.

H5 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE GROUND CIRCUIT
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1955-2 12V BATTERY POST (B+)

Does the test lamp illuminate?
Yes GO to H6
No INSPECT G107 for being clean and tight. If ok repair the circuit. Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC self-test.

H6 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE SWITCHED POWER CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BCMC C1002 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1955-1   Ground

Is any voltage present?
Yes REPAIR the circuit. Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC self-test.
No GO to H7

H7 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE SWITCHED POWER CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1955-1   Ground

Is the greater than 10,000 ohms?
Yes GO to H8
No REPAIR the circuit. Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC self-test.

H8 CHECK THE HIGH VOLTAGE BATTERY COOLANT DIVERTER VALVE SWITCHED POWER CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1955-1   C1002-4

Is the resistance less than 3 ohms?
Yes GO to H9
No REPAIR the circuit. Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC self-test.

H9 CLEAR ALL BCMC (BODY CONTROL MODULE C) AND SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Connect BCMC C1002 .
  • Connect High Voltage Battery Coolant Diverter Valve C1955 .
  • Using a diagnostic scan tool, clear the BCMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, clear the SOBDMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform SOBDMC self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0CDF:00, P0CE2:00, and/or P0CE3:12 present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs) DTC's. Repeat the SOBDMC and BCMC to check for normal operation
No The vehicle concern has been repaired.

PINPOINT TEST I: P0A0A:00, P0A0C:00, U3517:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

The high voltage battery incorporates hardwired interlock staple for the high voltage battery cable connection. The interlock circuit consists of a staple at the high voltage battery cable that closes the circuit when it is fully connected and opens when the high voltage cable is disconnected. An interlock circuit fault at the high voltage battery results in power limiting. This fault illuminates the stop safely hazard (red triangle) warning indicator and prevents the vehicle from starting. The interlock staple at the DCDC is not utilized. The interlock status is based on the high voltage measurement that is sent over the HS-CAN . An interlock circuit fault at the DCDC does not disable the high voltage system or prevent the vehicle from starting.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A0A:00 High Voltage System Interlock Circuit 'A': No Sub Type Information Sets when BECM senses the interlock input or output circuit is shorted to 12V, shorted to ground or open for 50 milliseconds.
BECM P0A0C:00 High Voltage System Interlock Circuit 'A' Low: No Sub Type Information Sets when BECM senses an interlock circuit or the 12-volt contactor control supply circuit is shorted to ground or open for 50 milliseconds.
BECM U3517:00 High Voltage System Interlock Circuit 'C' Low: No Sub Type Information Sets when a high voltage measurement at the DCDC and the SOBDMC has a difference of greater than 50.0V after the contactors have closed.

Possible Sources

  • Wiring, terminals or connectors
  • high voltage cable
  • BECM
  • DCDC

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

I1 RETRIEVE ALL THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, perform BECM self-test.
  • RECORD the DTC s

Are any DTC s other than P0A0A:00, P0A0C:00 or U3517:00 retrieved?
Yes REFER to the BECM DTC chart in this section and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No GO to I2

I2 REVIEW THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • REVIEW the BECM DTC s.

Is DTC P0A0A:00, P0A0C:00 or U3517:00 retrieved?
Yes For BECM DTC P0A0A:00 and/or P0A0C:00, GO to I9 For BECM DTC U3517:00, GO to I3
No The concern is not present at this time. The concern may be have been related to disconnecting a high voltage cable.

I3 CHECK THE DC/DC CONVERTER CONTROL MODULE HIGH VOLTAGE CABLE FOR BEING FULLY SEATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Check that the DCDC C1457A is connected and fully seated.

Was the connector connected and fully seated?
Yes GO to I4
No RECONNECT the connector and verify it is fully seated. Repower the high voltage system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Operate the system and determine if the concern is still present. If the concern is still present, GO to I4

I4 CHECK THE DC/DC CONVERTER CONTROL MODULE HIGH VOLTAGE CABLE FOR BEING OPEN
  • Disconnect High Voltage Battery C4236D .
  • Disconnect DCDC C1457A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236D-1   C1457A-2
      C4236D-2   C1457A-3

Is the resistance less than 3 ohms?
Yes GO to I5
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

I5 REVIEW AND RECORD THE INTERLOCK DTCS
  • Connect high voltage battery C4236D .
  • Connect DCDC C1457A .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, perform a Continuous Memory Diagnostic Trouble Codes (CMDTCs) self test.
  • Using a diagnostic scan tool, clear Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  • Using a diagnostic scan tool, perform a Continuous Memory Diagnostic Trouble Codes (CMDTCs) self test.

Is BECM DTC U3517:00 and SOBDMC DTC U351B:00 retrieved?
Yes GO to I6
No GO to I8

I6 CHECK THE HIGH VOLTAGE LOW CURRENT FUSE
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure the resistance of the high voltage low current fuse.

Is the resistance less than 3 ohms?
Yes GO to I8
No INSTALL a new high voltage low current fuse.
REFER to: High Voltage Low Current Fuse - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
GO to I7

I7 CHECK THE HIGH VOLTAGE BATTERY CABLE FOR BEING SHORTED
  • Disconnect High Voltage Battery C4236D .
  • Disconnect DC/DC Converter Control Module C1457A .
  • Disconnect ACCM C1803B .
  • Take measurements while performing a wiggle test of the high-voltage cable assembly.
    Click to display connectors

      High Voltage Battery


    Positive Lead Measurement / Action Negative Lead
      C4236D-1   C4236D-2
      C4236D-1 C4236D-1S (shield)
      C4236D-2 C4236D-1S (shield)

    Click to display connectors

      DCDC


    Positive Lead Measurement / Action Negative Lead
      C1457A-1   C1457A-4
      C1457A-1 C1457A-1S (shield)
      C1457A-4 C1457A-1S (shield)

Are the resistances greater than 10,000 ohms?
Yes GO to I8
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
Repower the high voltage system. REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Operate the system performing at least 2 ignition cycles to determine if the concern is still present. If the concern is still present, GO to I8

I8 CHECK FOR CORRECT DC/DC CONVERTER CONTROL MODULE OPERATION
  • Ignition OFF.
  • Inspect the DC/DC converter control module C1457A
  • For:
    • corrosion
    • damaged or bent pins
    • pushed-out pins
  • If any concerns are present INSTALL a new high voltage battery cable.
    REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Reconnect the DCDC C1457A. Make sure it seats and latches correctly.
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL new DC/DC converter control module.
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.

I9 CHECK FOR AN OPEN IN THE HIGH VOLTAGE CABLE INTERLOCK CIRCUIT FOR THE HIGH VOLTAGE BATTERY
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Check that the high voltage battery C4236D is fully seated. If the connector was NOT fully seated reseat the connector. Operate the system and determine if the concern is still present.
  • Disconnect High Voltage Battery C4236D .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C4236D-A C4236D-B

Is the resistance less than 3 ohms?
Yes GO to I10
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

I10 CHECK FOR A SHORT TO VOLTAGE IN THE INTERLOCK CIRCUIT AT LOW VOLTAGE CONNECTION AT THE HIGH VOLTAGE BATTERY
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-14 (female side)   Ground

Is there any voltage present?
Yes REPAIR the circuit.
No GO to I11

I11 CHECK FOR A SHORT TO GROUND IN THE INTERLOCK CIRCUIT AT LOW VOLTAGE CONNECTION AT THE HIGH VOLTAGE BATTERY
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-14 (female side)   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to I12
No REPAIR the circuit.

I12 CHECK FOR AN OPEN IN THE INTERLOCK CIRCUIT AT LOW VOLTAGE WIRING CONNECTION AT THE HIGH VOLTAGE BATTERY
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-14 (female side) C3733-20 (female side)

Is the resistance less than 3 ohms?
Yes GO to I13
No REPAIR the circuit.

I13 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) INTERLOCK CIRCUIT RESISTANCE INSIDE THE HIGH BATTERY PACK
  • Connect High Voltage Battery C4236D .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-14 (male side) C3733-20 (male side)

Is the resistance between 38K - 42K ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No GO to I14

I14 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) INTERLOCK CIRCUITS INSIDE THE HIGH VOLTAGE BATTERY PACK FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237B-10 CASE GROUND
      C4237B-11 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to I15
No INSTALL a new wiring harness.

I15 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) INTERLOCK CIRCUITS INSIDE THE HIGH BATTERY PACK FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-20 (male side)   C4236B-1
    C3733-14 (male side)   C4237B-11
      C4236B-2   C4237B-10

Is the resistance less than 3 ohms?
Yes GO to I16
No INSTALL a new wiring harness.

I16 CHECK FOR AN OPEN IN THE HIGH VOLTAGE BATTERY JUNCTION BOX INTERNAL INTERLOCK CIRCUIT
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C4236B-1 (component side) C4236D-A (component side)
    C4236B-2 (component side) C4236D-B (component side)

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST J: P1A1E:66

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactors to close, which will supply high-voltage power to the vehicle. During the contactor close sequence the main negative contactor closes first then the pre-charge contactor to limit the amount of inrush current flow prior to closure of the positive main contactor, which supplies high-voltage power to the vehicle. The BECM utilizes a counter to prevent greater than 15 precharge events within a calibrated period of time. The counter will increment for every successful pre-charge and decrement within a calibrated parameter and period of time. The stop safely hazard (red triangle) warning indicator illuminates and the vehicle will not start for the remaining of the ignition cycle.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P1A1E:66 Hybrid/EV Battery Contactor Control Signal: Signal Has Too Many Transitions/Events This DTC sets when the BECM detects greater than 15 successful precharge events within a calibrated time.

Possible Sources

  • Cycling of vehicle ignition switch

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

J1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Are any Diagnostic Trouble Codes (DTCs) other than P1A1E:66 present?
Yes REFER to the BECM DTC chart and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No CLEAR the DTC . The concern may be related to cycling of the ignition switch multiple times within a short period of time.

PINPOINT TEST K: P0A7E:00, P1A44:00

Refer to Wiring Diagrams Cell 21 for schematic and connector information. Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition in the ON position and the engine running or OFF, the BECM and SOBDMC monitors and maintains the high voltage battery temperature within a specific range. The electric powertrain cooling system utilizes a separate cooling circuit that consists of an high voltage battery coolant pump, high voltage battery radiator, high voltage battery coolant cooler (if equipped), and a coolant diverter valve to cool the high voltage battery. A high voltage battery coolant inlet temperature sensor that is hardwired to the BECM and mounted at the high voltage battery cooalnt inlet tube. The SOBDMC receives high voltage battery cooalnt temprature data from the HS-CAN and manages cooling of the high voltage battery by sending commands to the high voltage battery coolant pump, high voltage battery diverter valve, electric A/C compressor, and high voltage battery coolant cooler shut off valve. The BECM monitors a total of six thermistors are mounted inside the cell arrays that monitor high voltage battery temperature. If the high voltage battery reaches a critical temperature DTC P0A7E:00 sets and the BECM will shut the vehicle down and the stop safely hazard (red triangle) warning indicator warning illuminates.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A7E:00 Hybrid/EV Battery Pack 'A' Over Temperature: No Sub Type Information A fault is indicated when the BECM measures a battery pack temperature greater than 65°C (150°F). When this fault sets, the BECM shuts down the high voltage battery after 1 second after the stop safely hazard (red triangle) warning indicator is illuminated in the IPC . If this fault is cleared or repaired while the ignition is ON, the ignition must be cycled from ON to OFF and back to ON before the BECM commands the contactors to close again.
SOBDMC P1A44:00 A/C Disabled - Hybrid/EV Battery Overtemperature: No Sub Type Information This is a informational DTC that indicates the high voltage battery pack temperature reached an greater desired temperature and the SOBDMC disabled the A/C system for a calibrated amount time. This DTC sets on vehicles not equipped with a high voltage battery coolant cooler.

Possible Sources

  • Low coolant level
  • Airlock in system
  • Inoperative electric cooling fan
  • Coolant flow restriction
  • High voltage battery coolant pump
  • High voltage battery coolant diverter valve
  • High voltage battery radiator
  • Restricted airflow through high voltage battery radiator
  • High ambient temperatures
  • BCMC
  • BECM
  • Vehicle was in a paint booth with the temperature above 65°C (150°F) for longer than 45 minutes.

Visual Inspection and Pre-checks

  • Verify no front end damage is present.
  • Verify the coolant level is not low.
  • Inspect coolant pipes and hoses for kinks, leaks or other damage.
  • Inspect for air flow restrictions.
K1 RETRIEVE THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, perform the SOBDMC self-test.

Is DTC P2D40:00 present?
Yes DTC P2D40:00 is the result of the high voltage battery coolant cooler not operating as expected, Diagnose this DTC , GO to Pinpoint Test N
No GO to K2

K2 CLEAR DTCS AND PERFORM BECM (BATTERY ENERGY CONTROL MODULE) AND SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) SELF-TESTS
  • Ignition ON.
  • Using the scan tool, clear the BECM and SOBDMC Diagnostic Trouble Codes (DTCs)
  • Using a diagnostic scan tool, perform BECM and SOBDMC self-tests.

Are any electric powertrain cooling system related Diagnostic Trouble Codes (DTCs) other than P0A7E:00 and/or P1A44:00 present?
Yes For BECM Diagnostic Trouble Codes (DTCs), REFER to the BECM DTC chart and diagnose all other Diagnostic Trouble Codes (DTCs) first. For SOBDMC Diagnostic Trouble Codes (DTCs) P0CDF:00, P0CE2:00, P0CE3:00, P0CE3:12, GO to Pinpoint Test H For other SOBDMC Diagnostic Trouble Codes (DTCs),
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
No For P1A44:00 without P0A7E:00, RECORD the ambient temperture in the freeze frame data, otherwise GO to K3

K3 ACTIVE COMMAND THE HIGH VOLTAGE BATTERY COOLANT PUMP ON AND REPEAT BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00 and/or P2CF3:00 present or is the affected coolant pump inoperative?
Yes GO to Pinpoint Test AH
No GO to K4

K4 CHECK THE ELECTRIC POWERTRAIN COOLING SYSTEM COOLANT LEVEL
  • Ignition OFF.
  • Visually inspect the electric powertrain cooling system coolant level.

Is the electric powertrain coolant level significantly below the minimum line on the degas bottle?
Yes MEASURE and RECORD the coolant level from the MIN line. ADJUST the electric powertrain coolant level as necessary. Pressure test the electric powertrain cooling system and address any coolant leaks.
REFER to: Electric Powertrain Cooling (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Diagnosis and Testing).
GO to K5
No GO to K6

K5 PERFORM THE COOLING SYSTEM FILL ROUTINE
  • Ignition ON.
  • CONNECT the diagnostic tool.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, clear the SOBDMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform the cooling system fill routine and verify if the affected coolant pump is running by feeling the pump for vibration.
    REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03C Engine Cooling, General Procedures).

Is the coolant pump running?
Yes Using a diagnostic scan tool, clear the BECM and SOBDMC DTC's. PERFORM a road test to check for for normal vehicle operation. If the concern is still present, GO to K6
No GO to Pinpoint Test AH

K6 CHECK FOR AN AIR FLOW RESTRICTION
  • Check the electric powertrain radiators for external obstruction such as leaves or cardboard and verify all air deflectors are present.

Is an air flow restriction present.
Yes REPAIR as necessary. GO to K7
No GO to K7

K7 CHECK THE ACTIVE GRILL SHUTTER OPERATION
  • Ignition ON.
  • Connect the diagnostic tool.
  • Access the  PCM  and control the  GRILL_A_CMD (% Open)  PID

  • Active command the active grill shutter to open and close.

Did the active grill shutter open/close when commanded?
Yes GO to K8
No DIAGNOSE the active grill shutter concern.
REFER to: Active Grille Shutter (501-02 Front End Body Panels, Diagnosis and Testing).

K8 CHECK THE ELECTRIC COOLING FAN OPERATION
  • Ignition ON.
  • Connect the diagnostic tool.
  • Access the  PCM  and control the  FANELC_CMD (% Duty Cycle)  PID

  • Active command the electric cooling fan to 100%.

Did the electric cooling fan operate?
Yes GO to K9
No DIAGNOSE the electric cooling fan operation.
REFER to: Cooling Fan Control (303-03C Engine Cooling, Diagnosis and Testing).

K9 CHECK FOR CORRECT ELECTRIC POWERTRIN COOLANT HOSE ROUTING
  • Ignition OFF.
  • Check for correct coolant hose routing and connections to the to the cooalnt diverter valve, high voltage battery coolant pump, and the high voltage battery cool;ant cooler.
    REFER to: Electric Powertrain Cooling - Component Location (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Description and Operation).

Are the cooling system hoses routed correctly?
Yes GO to K10
No REPAIR as necessary.

K10 CHECK FOR A COOLANT FLOW RESTRICTION
  • Ignition OFF.
  • Verify there are no obvious coolant flow restrictions in the coolant hoses for the high voltage battery coolant circuit.
    REFER to: Electric Powertrain Cooling - Component Location (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Description and Operation).
  • Inspect the coolant hoses and pipes for:
    • damage
    • kinks

Are the cooling system hoses and components free from any kinks or damage?
Yes For DTC P1A44:00 without P0A7E:00 and the freeze frame ambient temperature PID previously recorded is greater than 38°C the concern may be related to the combination of high ambient temperatures and extended idle/low speed driving conditions that exceed 60 minutes. If the recorded ambient temepature is less than 38°C and/or if DTC P0A7E:00 is present INSTALL a new high voltage battery radiator,
REFER to: High Voltage Battery Radiator (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
No REPAIR or INSTALL new components as necessary.

PINPOINT TEST L: P0A7F:00

Normal Operation and Fault Conditions

The BECM monitors the health high voltage battery pack cell modules by monitoring voltage levels during various operation conditions. The High voltage Battery cells are continuously being discharged and charged that results in a reduction of battery cell life and an end of life counter begins to increment. If the end of life detection counter is greater than or equal to a calibrated threshold the DTC sets. The powertrain malfunction (wrench) indicator will illuminate when the fault condition is present. The fault cannot be cleared.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A7F:00 Hybrid/EV Battery Pack 'A' Deterioration: No Sub Type Information This DTC indicates the high voltage battery is determined to be in the end-of-life state and should be replaced. The customer may choose not to install a new high voltage battery due to the cost of replacement. If a new high voltage battery is not installed, the customer will experience reduced fuel economy and reduced power, which will eventually lead to a complete failure of the high voltage battery.

Possible Sources

  • High voltage battery
L1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Are any other Diagnostic Trouble Codes (DTCs) present other than P0A7F:00 present?
Yes REFER to the BECM DTC chart and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST M: P0A7D:00, P0DE6:00

Normal Operation and Fault Conditions

The BECM monitors the high voltage battery state-of-charge. When voltage drops to a low level, the vehicle will shut down and/or will not start/re-start until the voltage level has been increased to a nominal level. This condition may occur if the Internal Combustion Engine (ICE) fails to start, vehicle has been stored, or ignition left in accessory mode for an extended period of time. The stop safely hazard (red triangle) warning indicator will illuminate and the vehicle will shut down and not re-start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A7D:00 Hybrid/EV Battery Pack State of Charge Low: No Sub Type Information Sets when the ignition switch is first turned to the ON position, or when the ignition switch is in the START position and the high voltage battery State of Charge (SOC) of the battery pack is lower than a calibrated threshold.
BECM P0DE6:00 Hybrid/EV Battery Pack Cell Voltage Low: No Sub Type Information Sets if an instantaneous module cell voltage is discharged below a calibrated threshold for 10 seconds (contactors closed) or 90 seconds (contactors open). The stop safely hazard (red triangle) warning indicator and MIL illuminates. The high voltage battery will shutdown impacting electric motor propulsion and/or the vehicle will not start.

Possible Sources

  • Vehicle extended storage
  • Excessive engine start attempts
  • High voltage battery low state of charge
M1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Are any Diagnostic Trouble Codes (DTCs) other than P0A7D:00 and/or P0DE6:00 present?
Yes REFER to the BECM DTC Chart and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No If DTCs P0A7D:00 and/or P0DE6:00 return with no other DTCs, GO to M2 If no DTCs return concern is not present at this time. If the Internal Combustion Engine (ICE) has starting concerns (no start condition/hard start), address these conditions first. Starting concerns may result in hybrid battery pack low state of charge and caused these (DTCs) to set.

M2 MONITOR BECM (BATTERY ENERGY CONTROL MODULE) PID (PARAMETER IDENTIFICATION) HIGH VOLTAGE BATTERY VOLTAGE
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Using a diagnostic scan tool, view BECM PIDs.
  • Access the  BECM  and monitor the  HVBAT_V (V)  PID


Is HVBAT_V between 90 and 165 volts?
Yes GO to M3
No If HVBAT_V is greater than or equal to 165 volts, the high voltage battery has sufficient charge to crank over the internal combustion engine. If HVBAT_V is less than 90 volts turn ignition off, let vehicle soak for a few hours and recheck HVBAT_V. If voltage increases above 90 volts, GO to M3. If HVBAT_V remains below 90 volts the high voltage battery is discharged below a recoverable state as reported by the BECM . CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
REPEAT pinpoint test M2. If HVBAT_V is less than 90 volts, INSTALL a new high voltage battery. REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

M3 MONITOR BECM (BATTERY ENERGY CONTROL MODULE) CELL MINIMUM VOLTAGE PID
  • Using a diagnostic scan tool, view BECM PIDs.
  • Access the  BECM  and monitor the  HEV_BAT_MIN_V (V)  PID


Is HEVBAT_MIN_V greater than 1.45 volts?
Yes GO to M4
No CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
REPEAT the pinpoint test. If HEVBAT_MIN_V is less than 1.45 volts, INSTALL a new high voltage battery. REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

M4 MONITOR BECM (BATTERY ENERGY CONTROL MODULE) CELL VOLTAGE VARIANCE PID
  • Using a diagnostic scan tool, view BECM PIDs.
  • Access the  BECM  and monitor the  HEV_BAT_VAR_V (V)  PID


Is HEV_BAT_VAR_V less than 2.5 volts?
Yes GO to M5
No CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
If HEV_BAT_VAR_V is greater than 2.5 volts, INSTALL a new high voltage battery. REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

M5 CHECK THE HIGH VOLTAGE BATTERY TEMPERATURE
  • Using a diagnostic scan tool, view BECM PIDs.
  • Access the  BECM  and monitor the  H_BATT_TEMP (Deg C)  PID


Is BATT_TEMP between 0°C and 40°C?
Yes
REFER to: High Voltage Battery Charging - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
No Allow the vehicle to set a minimum of 2 hours with the ignition off inside a temperature controlled environment for the high voltage battery temperature to stabilize between 0°C and 40°C then proceed to charge the high voltage battery.
REFER to: High Voltage Battery Charging - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, General Procedures).

PINPOINT TEST N: P2D40:00

Refer to Wiring Diagrams Cell 21 for schematic and connector information. Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The electric powertrain cooling system utilizes a separate cooling circuit that consists of an high voltage battery coolant pump, high voltage battery radiator, high voltage battery coolant cooler, and a coolant diverter valve to cool the high voltage battery. A high voltage battery coolant inlet temperature sensor that is hardwired to the BECM and mounted at the high voltage battery coolant inlet tube. The SOBDMC receives high voltage battery coolant temperature data from the HS-CAN and manages cooling of the high voltage battery by sending commands to the high voltage battery coolant pump, high voltage battery diverter valve, electric A/C compressor, and high voltage battery coolant cooler shut off valve. Presence of DTC P2D40:00 indicates an high voltage battery cooling fault exists illuminating the MIL . This DTC may result in elevated high voltage battery temperature and loss of vehicle performance and/or shutdown.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
SOBDMC P2D40:00 Hybrid/EV Battery Cooling System 'C' Performance: No Sub Type Information A fault is indicated when the SOBDMC requests cooling of the high voltage battery by commanding on the electric A/C compressor and high voltage battery coolant cooler and the high voltage battery coolant inlet temperature does not drop by more than 3°C (6°F) in 5 minutes.

Possible Sources

  • Low coolant level
  • Airlock in system
  • Inoperative electric cooling fan
  • Coolant flow restriction
  • High voltage battery coolant pump
  • High voltage battery coolant diverter valve
  • Restricted airflow through the A/C condenser
  • BCMC
  • ACCM fault
  • High voltage battery coolant cooler

Visual Inspection and Pre-checks

  • Verify no front end damage is present.
  • Verify the electric powertrain coolant level is not low.
  • Inspect coolant pipes and hoses for kinks, leaks or other damage.
  • Inspect for air flow restrictions through the A/C condenser.
N1 RETRIEVE ALL BCMC (BODY CONTROL MODULE C) AND SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Ignition ON.
  • Enter the following diagnostic mode: Self Test - BCMC .
  • Enter the following diagnostic mode: Self Test - SOBDMC .
  • Record any Diagnostic Trouble Codes (DTCs).

Are any Diagnostic Trouble Codes (DTCs) related to the ACCM , high voltage battery coolant cooler shut off valve or high voltage battery coolant diverter valve?
Yes For SOBDMC coolant diverter valve Diagnostic Trouble Codes (DTCs), refer to the DTC chart in this section. For other Diagnostic Trouble Codes (DTCs),
REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)/Electronic Automatic Temperature Control (EATC) (412-00 Climate Control System - General Information, Diagnosis and Testing).
No GO to N2

N2 ACTIVE COMMAND THE HIGH VOLTAGE BATTERY COOLANT PUMP ON AND PERFORM BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00 and/or P2CF3:00 present or is the affected coolant pump inoperative?
Yes Clear the SOBDMC GO to Pinpoint Test AH
No GO to N3

N3 CHECK THE ELECTRIC POWERTRAIN COOLING SYSTEM COOLANT LEVEL
  • Ignition OFF.
  • If necessary, allow the cooling system to cool near ambient temperature.
  • Visually inspect the electric powertrain cooling system coolant level.

Is the electric powertrain coolant level below the minimum line on the degas bottle?
Yes MEASURE and RECORD the coolant level from the MIN line. ADJUST the electric powertrain coolant level as necessary. Pressure test the electric powertrain cooling system and address any coolant leaks.
REFER to: Electric Powertrain Cooling (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Diagnosis and Testing).
GO to N4
No GO to N5

N4 PERFORM THE COOLING SYSTEM FILL ROUTINE
  • Ignition ON.
  • CONNECT the diagnostic tool.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, clear the SOBDMC Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform the cooling system fill routine and verify if the affected coolant pump is running by feeling the pump for vibration.
    REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03C Engine Cooling, General Procedures).

Is the coolant pump running?
Yes Using a diagnostic scan tool, clear the BECM and SOBDMC DTC's. PERFORM a road test to check for for normal vehicle operation. If the concern is still present, GO to N5
No GO to Pinpoint Test AH

N5 CHECK FOR AN AIR FLOW RESTRICTION
  • Check the A/C condenser for an airflow obstruction such as leaves or cardboard and verify all air deflectors are present.

Is an air flow restriction present?
Yes REPAIR as necessary. GO to N6
No GO to N6

N6 CHECK THE ACTIVE GRILL SHUTTER OPERATION
  • Ignition ON.
  • Connect the diagnostic tool.
  • Access the  PCM  and control the  GRILL_A_CMD (% Open)  PID

  • Active command the active grill shutter to open and close.

Did the active grill shutter open/close when commanded?
Yes GO to N7
No DIAGNOSE the active grill shutter concern.
REFER to: Active Grille Shutter (501-02 Front End Body Panels, Diagnosis and Testing).
GO to N11

N7 CHECK THE ELECTRIC COOLING FAN OPERATION
  • Ignition ON.
  • Connect the diagnostic tool.
  • Access the  PCM  and control the  FANELC_CMD (% Duty Cycle)  PID

  • Active command the electric cooling fan to 100%.

Did the electric cooling fan operate?
Yes GO to N8
No DIAGNOSE the electric cooling fan operation.
REFER to: Cooling Fan Control (303-03C Engine Cooling, Diagnosis and Testing).
GO to N11

N8 CHECK FOR CORRECT ELECTRIC POWERTRIN COOLANT HOSE ROUTING
  • Ignition OFF.
  • Check for correct coolant hose routing and connections to the to the cooalnt diverter valve, high voltage battery coolant pump, and the high voltage battery cool;ant cooler.
    REFER to: Electric Powertrain Cooling - Component Location (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Description and Operation).

Are the cooling system hoses routed correctly?
Yes GO to N9
No REPAIR as necessary. GO to N11

N9 CHECK FOR A COOLANT FLOW RESTRICTION
  • Ignition OFF.
  • Verify there are no obvious coolant flow restrictions in the coolant hoses for the high voltage battery.
    REFER to: Electric Powertrain Cooling - Component Location (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Description and Operation).
  • Inspect the coolant hoses and pipes for:
    • damage
    • kinks

Are the cooling system hoses and components free from any kinks or damage?
Yes GO to N10
No REPAIR or INSTALL new components as necessary. GO to N11

N10 CHECK THE A/C (AIR CONDITIONING) SYSTEM PERFORMANCE

NOTE: For vehicles equippled with a high voltage battery coolant cooler the A/C system is utilized to cool the high voltage battery coolant.

  • Check the A/C system operation and outlet temperature performance.
    REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)/Electronic Automatic Temperature Control (EATC) (412-00 Climate Control System - General Information, Diagnosis and Testing).

Are any concerns present?
Yes Diagnose the A/C system performance concern.
REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)/Electronic Automatic Temperature Control (EATC) (412-00 Climate Control System - General Information, Diagnosis and Testing).
GO to N11
No GO to N11

N11 CHECK THE HIGH VOLTAGE BATTERY COOLING SYSTEM PERFORMANCE
  • If necessary, place the vehicle at a location with a minimum ambient temperature of 18°C (65°F) for 3 hours.
  • Ignition ON.
  • Access the  SOBDMC  and control the  HYTRACB_THRM_OP  PID

    and active command the parameter to Battery Cooling - Request Coolant Flow Through Radiator (with Fan Request)
  • Wait for 5 minutes (fan and pump will be on).
  • Access the  BECM  and monitor the  BAT_COOL_INLETTEMP (Deg C)  PID

    and verify the PID value is greater than or equal to 18°C (65°F). If it is not repeat steps 2-4 until the temperature is achieved.
  • Record the coolant inlet temperature PID value.
  • Access the  SOBDMC  and control the  HYTRACB_THRM_OP  PID

    and active command the parameter to Battery Cooling - Request Coolant Flow Through Chiller (Maximum Coolant flow)
  • Wait for 5 minutes.
  • Access the  BECM  and monitor the  BAT_COOL_INLETTEMP (Deg C)  PID

  • Record the PID value.

Did the recorded coolant inlet temperature values indicate a drop of 3°C (6°F) or greater?
Yes System is operating properly at this time. CLEAR the SOBDMC Diagnostic Trouble Codes (DTCs). CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
No Verify high voltage battery coolant cooler fins are cold to touch. If not, INSTALL a new high voltage battery coolant cooler,
REFER to: High Voltage Battery Coolant Cooler (412-03 Supplemental Climate Control, Removal and Installation).
If high voltage battery coolant cooler fins are cold check for high voltage battery coolant pump Diagnostic Trouble Codes (DTCs), If present, GO to Pinpoint Test AH If not present, check for high voltage battery coolant diverter valve Diagnostic Trouble Codes (DTCs), If present, GO to Pinpoint Test H If not present, INSTALL a new high voltage battery coolant diverter valve.
REFER to: High Voltage Battery Coolant Diverter Valve (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
Test the vehicle for normal operation. If the concern is still present, INSTALL a new BCMC ,
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).

PINPOINT TEST O: HIGH VOLTAGE BATTERY TEMPERATURE SENSOR FAULTS

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition in the ON position and the engine running or OFF, the BECM monitors the high voltage battery internal temperature by taking an average of six temperature thermistors. If the difference between the measurement reading of one temperature sensor and the average reading of the remaining temperature sensors exceeds a calibrated threshold a DTC sets. The BECM uses temperature information to control and maintain high voltage battery temperature. An individual temperature sensor failure will not set a MIL or affect vehicle performance. If three or more individual temperature sensor faults are detected the MIL and wrench indicator will be illuminated and vehicle power will be limited.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0A9C:00 Hybrid/EV Battery Temperature Sensor 'A' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0A9D:00 Hybrid/EV Battery Temperature Sensor 'A' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0A9E:00 Hybrid/EV Battery Temperature Sensor 'A' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0AC6:00 Hybrid/EV Battery Temperature Sensor 'B' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0AC7:00 Hybrid/EV Battery Temperature Sensor 'B' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0AC8:00 Hybrid/EV Battery Temperature Sensor 'B' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0ACB:00 Hybrid/EV Battery Temperature Sensor 'C' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0ACC:00 Hybrid/EV Battery Temperature Sensor 'C' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0ACD:00 Hybrid/EV Battery Temperature Sensor 'C' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0AE9:00 Hybrid/EV Battery Temperature Sensor 'D' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0AEA:00 Hybrid/EV Battery Temperature Sensor 'D' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0AEB:00 Hybrid/EV Battery Temperature Sensor 'D' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0BC3:00 Hybrid/EV Battery Temperature Sensor 'E' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0BC4:00 Hybrid/EV Battery Temperature Sensor 'E' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0BC5:00 Hybrid/EV Battery Temperature Sensor 'E' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0C34:00 Hybrid/EV Battery Temperature Sensor 'F' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of the thermistor measurement is beyond the average range of the remaining thermistors for 5 seconds.
BECM P0C35:00 Hybrid/EV Battery Temperature Sensor 'F' Circuit Low: No Sub Type Information Sets if BECM senses a short to voltage in the thermistor circuitry for 5 seconds.
BECM P0C36:00 Hybrid/EV Battery Temperature Sensor 'F' Circuit High: No Sub Type Information Sets if BECM senses an open in the thermistor circuitry for 5 seconds.
BECM P0ECA:00 Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation: No Sub Type Information This DTC sets when the BECM detects 3 or more battery temperature thermistor faults. Address all other Diagnostic Trouble Codes (DTCs) first.

Possible Sources

  • BECM
  • High voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

O1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Are any temperature sensor Diagnostic Trouble Codes (DTCs) present?
Yes GO to O2
No The concern is not present at this time.

O2 CHECK THE FAULTED THERMISTOR FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors

      Temperature Sensor A

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237C-9 CASE GROUND
      C4237C-10 CASE GROUND

    Click to display connectors

      Temperature Sensor B

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237C-12 CASE GROUND
      C4237C-13 CASE GROUND

    Click to display connectors

      Temperature Sensor C

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237D-9 CASE GROUND
      C4237D-10 CASE GROUND

    Click to display connectors

      Temperature Sensor D

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237D-12 CASE GROUND
      C4237D-13 CASE GROUND

    Click to display connectors

      Temperature Sensor E

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237C-15 CASE GROUND
      C4237C-16 CASE GROUND

    Click to display connectors

      Temperature Sensor F

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237D-15 CASE GROUND
      C4237D-16 CASE GROUND

Are the resistances greater than 10,000 ohms?
Yes GO to O3
No INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

O3 MEASURE THE FAULTED THERMISTOR RESISTANCE FROM BECM (BATTERY ENERGY CONTROL MODULE)
  • Measure:
    Click to display connectors

      Temperature Sensor A


    Positive Lead Measurement / Action Negative Lead
      C4237C-9   C4237C-10

    Click to display connectors

      Temperature Sensor B


    Positive Lead Measurement / Action Negative Lead
      C4237C-12   C4237C-13

    Click to display connectors

      Temperature Sensor C


    Positive Lead Measurement / Action Negative Lead
      C4237D-9   C4237D-10

    Click to display connectors

      Temperature Sensor D


    Positive Lead Measurement / Action Negative Lead
      C4237D-12   C4237D-13

    Click to display connectors

      Temperature Sensor E


    Positive Lead Measurement / Action Negative Lead
      C4237C-15   C4237C-16

    Click to display connectors

      Temperature Sensor F


    Positive Lead Measurement / Action Negative Lead
      C4237D-15   C4237D-16

    Click to display connectors
    Temperature Range Resistance Range
    -30°C (-22°F) to -20°C (-4°F) 305,400 ohms - 564,900 ohms
    -20°C (-4°F) to -10°C (14°F) 171,600 ohms - 305,400 ohms
    -10°C (14°F) - 0°C (32°F) 100,100 ohms - 171,600 ohms
    0°C (32°F) - 10°C (51°F) 60,440 ohms - 100,100 ohms
    10°C (50°F) - 20°C (68°F) 37,620 ohms - 60,440 ohms
    20°C (68°F) - 30°C (86°F) 24,080 ohms - 37,620 ohms
    30°C (86°F) - 40°C (104°F) 15,830 ohms - 24,080 ohms
    40°C (104°F) - 50°C (122°F) 10,670 ohms - 15,830 ohms

Is the resistance value correct for the temperature?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST P: P1A0F:68

Refer to Wiring Diagrams Cell 13 for schematic and connector information.

Normal Operation and Fault Conditions

The high voltage battery incorporates hardwired interlock staples for the high voltage battery cable connections. The BECM is notified if an external interlock circuit fault occurs other than at the high voltage battery. If the interlock circuit fault occurs at the SOBDMC also known as the Inverter System Controller (ISC) the BECM sets P1A0F:68 DTC and results in power limiting. This fault illuminates the stop safely hazard (red triangle) warning indicator and prevents the vehicle from starting.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P1A0F:68 Hybrid Powertrain Control Module - Vehicle Disabled: Event Information This DTC is informational only and indicates that the vehicle has been disabled. Diagnose all SOBDMC Diagnostic Trouble Codes (DTCs).
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).

Possible Sources

  • Wiring, terminals or connectors
  • SOBDMC
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST Q: P0563:00, P0AA1:00, P0AA2:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactor to close and supply high-voltage power to the vehicle. The BECM monitors the voltage at the sense circuits downstream of the contactors to verify if they open and close correctly. The stop safely hazard (red triangle) warning indicator will illuminate for both Diagnostic Trouble Codes (DTCs). For DTC P0563:00 and P0AA1:00, the wrench indicator will illuminate and the vehicle will not start at the next ignition cycle. For DTC P0AA2:00, the vehicle is shut down.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0563:00 System Voltage High: No Sub Type Information Sets if BECM detects high voltage on the positive main contactor voltage sense circuit for 10 milliseconds after the ignition is turned on indicating that the main positive contactor is stuck closed.
BECM P0AA1:00 Hybrid/EV Battery Positive Contactor 'A' Stuck Closed: No Sub Type Information Sets if BECM detects the contactor is stuck closed for 60 seconds.
BECM P0AA2:00 Hybrid/EV Battery Positive Contactor 'A' Stuck Open: No Sub Type Information Sets if BECM detects the contactor is stuck open for 2.4 seconds.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Q1 CHECK FOR STUCK CLOSED POSITIVE AND NEGATIVE CONTACTOR DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, review the BECM Diagnostic Trouble Codes (DTCs)
  • Record all the BECM Diagnostic Trouble Codes (DTCs).

Are Diagnostic Trouble Codes (DTCs) P0563:00 and/or P0AA1:00 with P0AA4:00 present?
Yes INSTALL a new high voltage battery (Do not open the high voltage battery).
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No GO to Q2

Q2 REVIEW ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Review all the BECM Diagnostic Trouble Codes (DTCs).

Are Diagnostic Trouble Codes (DTCs) P0AD9:00, P0ADB:00, P0ADC:00, and/or U3012:00 present?
Yes If DTC P0AD9:00, P0ADB:00, P0ADC:00, and/or U3012:00 is present REFER to the BECM DTC Chart and diagnose the Diagnostic Trouble Codes (DTCs) first.
No For DTC P0AA2:00 without P0AA1:00 and/or P0563:00, GO to Q3For DTC P0AA1:00 with or without P0AA2:00 and/or P0563:00, GO to Q4

Q3 CLEAR ALL BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES
  • Ignition ON.
  • Using a diagnostic scan tool, CLEAR all BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AA2:00 present?
Yes GO to Q4
No The concern is not present at this time.

Q4 CHECK THE POSITIVE CONTACTOR VOLTAGE SENSE CIRCUIT CONNECTORS FOR BEING FULLY SEATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • CHECK the following connector for being fully seated.
    • Inline (positive contactor voltage sense) C4239B
    • High Voltage Battery Junction Box C4236A

Were the connectors fully seated?
Yes GO to Q5
No Reseat the affected connector(s). Re-install the High Voltage battery enclosure and the High Voltage Battery. Repower the High Voltage system. Operate the system to check for normal vehicle operation.

Q5 CHECK CONTACTOR CONTROL CIRCUITS FOR A SHORT TO CASE GROUND
  • Connect a jumper wire between:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
    C4238-25 (male side) CASE GROUND
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Ignition OFF.
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236B-5 CASE GROUND
      C4236B-8 CASE GROUND

Are the resistances greater than 10,000 ohms?
Yes GO to Q6
No INSTALL a new wiring harness.

Q6 CHECK CONTACTOR CONTROL CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-5   C4237B-6
      C4236B-8 C3733-8 (male side)

Are the resistances less than 3 ohms?
Yes GO to Q7
No INSTALL a new wiring harness.

Q7 CHECK CONTACTOR CONTROL CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-5   C4236B-8

Is the resistance greater than 10,000 ohms?
Yes For DTC P0AA1:00, GO to Q8. For DTC P0AA2:00, GO to Q9.
No INSTALL a new wiring harness.

Q8 CHECK THE POSITIVE CONTACTOR RELAY FOR BEING STUCK CLOSED
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C4236F-1 (component side) C4236D-4 (component side)

Are the resistances less than 3 ohms?
Yes GO to Q9
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

Q9 INSTALL A NEW HIGH VOLTAGE BATTERY JUNCTION BOX
  • INSTALL a new high voltage battery junction box.
    REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • INSTALL the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Did DTC P0AA1:00 and/or P0AA2:00 return?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative high voltage battery junction box. The system is now operating correctly.

PINPOINT TEST R: P0AA4:00, P0AA5:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactor to close which will supply power to the vehicle. The BECM monitors the voltage at the sense circuits downstream of the contactors to verify if they open and close correctly. The stop safely hazard (red triangle) warning indicator will illuminate for both Diagnostic Trouble Codes (DTCs). For DTC P0AA5:00, the vehicle is shut down.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AA4:00 Hybrid/EV Battery Negative Contactor 'A' Stuck Closed: No Sub Type Information Sets if BECM detects the contactor is stuck closed for 60 seconds after being commanded open.
BECM P0AA5:00 Hybrid/EV Battery Negative Contactor 'A' Stuck Open: No Sub Type Information Sets if BECM detects the contactor is stuck open for 2.4 seconds after being commanded closed.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

R1 CHECK FOR STUCK CLOSED POSITIVE AND NEGATIVE CONTACTOR DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, review the BECM Diagnostic Trouble Codes (DTCs)
  • Record all the BECM Diagnostic Trouble Codes (DTCs).

Are BOTH Diagnostic Trouble Codes (DTCs) P0AA1:00 and P0AA4:00 present?
Yes INSTALL a new high voltage battery (Do not open the high voltage battery).
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No GO to R2

R2 REVIEW ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Review all the BECM Diagnostic Trouble Codes (DTCs).

Are Diagnostic Trouble Codes (DTCs) P0ADD:00, P0ADF:00, P0AE0:00, and/ or U3012:00 present?
Yes If DTC P0ADD:00, P0ADF:00, P0AE0:00, and/ or U3012:00 is present REFER to the BECM DTC Chart and diagnose the Diagnostic Trouble Codes (DTCs) first.
No For DTC P0AA5:00 without P0AA4:00, GO to R3For DTC P0AA4:00 with or without P0AA5:00, GO to R4

R3 CLEAR ALL BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES
  • Ignition ON.
  • Using a diagnostic scan tool, CLEAR all BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AA5:00 present?
Yes GO to R4
No The concern is not present at this time.

R4 CHECK THE NEGATIVE CONTACTOR VOLTAGE SENSE CIRCUIT CONNECTORS FOR BEING FULLY SEATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • CHECK the following connectors for being fully seated.
    • Inline (negative contactor voltage sense) C4239A
    • High Voltage Battery Junction Box C4236A

Were the connectors fully seated?
Yes GO to R5
No Reseat the affected connector(s). Re-install the High Voltage battery enclosure and the High Voltage Battery into the vehicle. Repower the High Voltage system. Operate the system to check for normal vehicle operation.

R5 CHECK CONTACTOR CONTROL CIRCUITS FOR A SHORT TO CASE GROUND
  • Connect a jumper wire between:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
    C4238-25 (male side) CASE GROUND
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236B-6 CASE GROUND
      C4236B-8 CASE GROUND

Are the resistances greater than 10,000 ohms?
Yes GO to R6
No INSTALL a new wiring harness.

R6 CHECK CONTACTOR CONTROL CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-6   C4237B-8
      C4236B-8 C3733-8 (male side)

Are the resistances less than 3 ohms?
Yes GO to R7
No INSTALL a new wiring harness.

R7 CHECK CONTACTOR CONTROL CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-6   C4236B-8

Is the resistance greater than 10,000 ohms?
Yes For DTC P0AA4:00, GO to R8 For DTC P0AA5:00, GO to R9 GO to R9
No INSTALL a new wiring harness.

R8 CHECK NEGATIVE CONTACTOR RELAY FOR BEING STUCK CLOSED
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C4236E-1 (component side) C4236D-3 (component side)

Is the resistance less than 3 ohms?
Yes GO to R9
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

R9 INSTALL A NEW HIGH VOLTAGE BATTERY JUNCTION BOX
  • INSTALL a new high voltage battery junction box.
    REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • INSTALL the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AA4:00 and/or P0AA5:00 retrieved?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative high voltage battery junction box. The system is now operating correctly.

PINPOINT TEST S: P0AA6:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition in the ON position, the BECM monitors the electrical isolation (leakage resistance) between the high-voltage system and the vehicle chassis. When the engine is run and the resistance value is less than 400,000 ohms, the electrical isolation fault is set. The fault will illuminate the stop safely hazard (red triangle) warning indicator, and the vehicle will not start at the next ignition cycle if the leakage is severe.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AA6:00 Hybrid/EV Battery Pack 'A' Voltage System Isolation Fault: No Sub Type Information Sets if BECM detects a high voltage system leakage resistance value of less than 400,000 ohms.

Possible Sources

  • Transmission fluid coolant contamination
  • Moisture/water penetration of high-voltage connectors
  • High voltage battery cables
  • Direct Current/Direct Current (DC/DC) converter control module
  • ACCM
  • High voltage battery
  • Electronically Controlled Continuously Variable Transmission (eCVT)
  • SOBDMC

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

S1 INSPECT FOR TRANSMISSION FLUID COOLANT CONTAMINATION
  • Remove the transmission fluid level indicator and inspect for coolant contamination.
    REFER to: Transmission Fluid Level Check (307-01B Automatic Transmission - Automatic Transmission – HF45, General Procedures).

Is the transmission fluid contaminated with coolant?
Yes ADDRESS the concern.
REFER to: Diagnosis By Symptom (307-01B Automatic Transmission - Automatic Transmission – HF45, Diagnosis and Testing).
CLEAR the BECM Diagnostic Trouble Codes (DTCs). REPEAT the BECM self test.
No GO to S2

S2 DETERMINE IF THE VEHICLE STARTS
  • Attempt to start the vehicle depressing the brake pedal and pressing the start button.

Does the ready to drive indicator illuminate?
Yes This indicates the leakage fault is mild or there is an intermittent fault condition, GO to S3
No This indicates a severe leakage fault is currently present, GO to S3

S3 MONITOR THE LEAKAGE RESISTANCE PIDS

NOTE: Clear the BECM Diagnostic Trouble Codes (DTCs) or the vehicle may not start.

  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF for a minimum of 1 minute.
  • Ignition ON.
  • Using a diagnostic scan tool, view BECM PIDs.
  • Select the following BECM PIDs:
    • Access the  BECM  and monitor the  LEAKRESPOS (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESNEG (Ohm)  PID

    • Access the  BECM  and monitor the  LEAK_RES_OVERALL (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESCON (Ohm)  PID

  • NOTE: For a severe leakage fault the Diagnostic Trouble Codes (DTCs) must be cleared or the vehicle may not start. Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • NOTE: For a severe leakage fault the ignition must be left OFF for a minimim of 1 minute or the Diagnostic Trouble Codes (DTC) may not repeat and the leakage PID values may not be valid. Ignition OFF for a minimum of 1 minute.
  • NOTE: Once the ignition is switched to ON the scan tool requires 10 seconds to re-establish the connection. Once the connection is established there will be 10 seconds of viewable data before the contactors open and the PID values default to a normal value of 1.6M ohms making it appear the vehicle fault is no longer present. This does not apply to a mild leakage fault. While viewing datalogger, switch the ignition ON and select continue.

Does the LEAK_RES_OVERALL PID read greater than 400,000 ohms and/or 1.6M ohms for at least 10 seconds?
Yes CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. If the DTC is not present at this time, DEPOWER the high voltage battery system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
INSPECT the high voltage system for any physical damage. INSPECT the high voltage cables between the high voltage battery, SOBDMC , ACCM and electric compressor assembly, and DCDC for chafing or damaged insulation. If damage is found, INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No If LEAKRESCON is 0 ohms the conditions have not been met to obtain an accurate reading. REPEAT steps 1-4. If LEAKRESCON is greater than 1,000 ohms and less than 400,000 ohms, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
If LEAKRESCON is greater than 400,000 ohms, GO to S4

S4 CHECK THE HIGH VOLTAGE BATTERY CABLE
  • Ignition OFF
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Disconnect the 12-volt battery.
    REFER to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).
  • Disconnect High Voltage Battery C4236D .
  • Disconnect SOBDMC C199C .
  • Disconnect DC/DC Converter Control Module C1457A .
  • Disconnect ACCM C1803B .
  • Take measurements while performing a wiggle test of the high-voltage cable assembly.
    Click to display connectors

      High Voltage Battery


    Positive Lead Measurement / Action Negative Lead
      C4236D-1   Ground
      C4236D-2   Ground
      C4236D-3   Ground
      C4236D-4   Ground
      C4236D-1 C4236D-1S (shield)
      C4236D-2 C4236D-1S (shield)
      C4236D-3 C4236D-2S (shield)
      C4236D-4 C4236D-2S (shield)

    Click to display connectors

      DCDC


    Positive Lead Measurement / Action Negative Lead
      C1457A-1   C1457A-4
      C1457A-1 C1457A-1S (shield)
      C1457A-4 C1457A-1S (shield)

Are the resistances greater than 400,000 ohms?
Yes GO to S6
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
GO to S5

S5 MONITOR THE LEAKAGE RESISTANCE PIDS
  • Connect the 12-volt battery.
    REFER to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).
  • Connect High Voltage Battery C4236D .
  • Connect SOBDMC C199C .
  • Connect DC/DC Converter Control Module C1457A .
  • Connect ACCM C1803B .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON
  • Using a diagnostic scan tool, view BECM PIDs.
  • Select the following BECM PIDs:
    • Access the  BECM  and monitor the  LEAKRESPOS (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESNEG (Ohm)  PID

    • Access the  BECM  and monitor the  LEAK_RES_OVERALL (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESCON (Ohm)  PID

  • NOTE: For a severe leakage fault the Diagnostic Trouble Codes (DTCs) must be cleared or the vehicle may not start. Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • NOTE: For a severe leakage fault the ignition must be left OFF for a minimim of 1 minute or the Diagnostic Trouble Codes (DTC) may not repeat and the leakage PID values may not be valid. Ignition OFF for a minimum of 1 minute.
  • NOTE: Once the ignition is switched to ON the scan tool requires 10 seconds to re-establish the connection. Once the connection is established there will be 10 seconds of viewable data before the contactors open and the PID values default to a normal value of 1.6M ohms making it appear the vehicle fault is no longer present. This does not apply to a mild leakage fault. While viewing datalogger, switch the ignition ON and select continue.

Are LEAKRESPOS, LEAKRESNEG and LEAK_RES_OVERALL read greater than 400,000 ohms for at least 10 seconds?
Yes The concern was caused by an inoperative high voltage battery cable. The system is now operating correctly.
No GO to S6

S6 MONITOR THE LEAKAGE RESISTANCE PIDS WITH THE DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) AND ACCM (AIR CONDITIONING CONTROL MODULE) ISOLATED

NOTE: Cover the high voltage connectors with electrical tape to prevent accidental exposure to high voltage.

  • Ignition OFF
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Disconnect DC/DC Converter Control Module C1457A .
  • Disconnect ACCM C1803B .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON
  • Using a diagnostic scan tool, view BECM PIDs.
  • Select the following BECM PIDs:
    • Access the  BECM  and monitor the  LEAKRESPOS (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESNEG (Ohm)  PID

    • Access the  BECM  and monitor the  LEAK_RES_OVERALL (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESCON (Ohm)  PID

  • NOTE: For a severe leakage fault the Diagnostic Trouble Codes (DTCs) must be cleared or the vehicle may not start. Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • NOTE: For a severe leakage fault the ignition must be left OFF for a minimim of 1 minute or the Diagnostic Trouble Codes (DTC) may not repeat and the leakage PID values may not be valid. Ignition OFF for a minimum of 1 minute.
  • NOTE: Once the ignition is switched to ON the scan tool requires 10 seconds to re-establish the connection. Once the connection is established there will be 10 seconds of viewable data before the contactors open and the PID values default to a normal value of 1.6M ohms making it appear the vehicle fault is no longer present. This does not apply to a mild leakage fault. While viewing datalogger, switch the ignition ON and select continue.

Are LEAKRESPOS, LEAKRESNEG and LEAK_RES_OVERALL read greater than 400,000 ohms for at least 10 seconds?
Yes GO to S7
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new Inverter System Controller (ISC).
REFER to: Inverter System Controller [SOBDMC] (303-14D Electric Powertrain Control, Removal and Installation).

S7 MONITOR THE LEAKAGE RESISTANCE PIDS WITH THE ACCM (AIR CONDITIONING CONTROL MODULE) ISOLATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Connect DCDC C1457A .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON
  • Using a diagnostic scan tool, view BECM PIDs.
  • Select the following BECM PIDs:
    • Access the  BECM  and monitor the  LEAKRESPOS (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESNEG (Ohm)  PID

    • Access the  BECM  and monitor the  LEAK_RES_OVERALL (Ohm)  PID

    • Access the  BECM  and monitor the  LEAKRESCON (Ohm)  PID

  • NOTE: For a severe leakage fault the Diagnostic Trouble Codes (DTCs) must be cleared or the vehicle may not start. Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • NOTE: For a severe leakage fault the ignition must be left OFF for a minimim of 1 minute or the Diagnostic Trouble Codes (DTC) may not repeat and the leakage PID values may not be valid. Ignition OFF for a minimum of 1 minute.
  • NOTE: Once the ignition is switched to ON the scan tool requires 10 seconds to re-establish the connection. Once the connection is established there will be 10 seconds of viewable data before the contactors open and the PID values default to a normal value of 1.6M ohms making it appear the vehicle fault is no longer present. This does not apply to a mild leakage fault. While viewing datalogger, switch the ignition ON and select continue.

Are LEAKRESPOS, LEAKRESNEG and LEAK_RES_OVERALL read greater than 400,000 ohms for at least 10 seconds?
Yes INSTALL a new ACCM .
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).
No INSTALL new DCDC .
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).

PINPOINT TEST T: P0AA7:00

Normal Operation and Fault Conditions

With the ignition in the ON position and the engine running or OFF (the engine must have run at least once after the ignition was cycled to ON), the BECM monitors the electrical isolation (leakage resistance) between the high-voltage system and the vehicle chassis. The BECM monitors the electrical isolation circuits for faults. If a fault is present DTC P0AA7:00 sets.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AA7:00 Hybrid/EV Battery Pack 'A' Voltage Isolation Sensor Circuit: No Sub Type Information Sets when BECM senses the leakage detection circuit is faulted.

Possible Sources

  • BECM
T1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AA7:00 present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern is not present at this time.

PINPOINT TEST U: P0C43:00, P0C44:00, P0C45:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition in the ON position and the engine running or OFF, the BECM monitors the high voltage battery coolant inlet temperature circuits for faults. The high voltage battery coolant temperature is mounted to the coolant hose external to the battery pack and hardwired to the BECM . If the BECM senses a battery pack coolant temperature fault, it will illuminate the powertrain malfunction (wrench) indicator and set a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0C43:00 Hybrid/EV Battery Pack Coolant Temperature Sensor 'A' Circuit Range/Performance: No Sub Type Information Sets if BECM senses the difference of greater than or equal to 28°C (82°F) between high voltage battery coolant temperature and the high voltage battery pack temperature after a key off timer reading of greater than or equal to 6 hours.
BECM P0C44:00 Hybrid/EV Battery Pack Coolant Temperature Sensor 'A' Circuit Low: No Sub Type Information Sets if BECM senses less than -47.27°C (-53.1°F) from the high voltage battery coolant temperature sensor for 10 seconds or more.
BECM P0C45:00 Hybrid/EV Battery Pack Coolant Temperature Sensor 'A' Circuit High: No Sub Type Information Sets if BECM senses greater than 98.3°C (208.94°F) from the high voltage battery coolant temperature sensor for 10 seconds or more.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery coolant temperature sensor
  • BECM

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

U1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0C43:00, P0C44:00, and/or P0C45:00 present?
Yes GO to U2
No The concern is not present at this time.

U2 MEASURE THE COOLANT TEMPERATURE SENSOR REFERENCE VOLTAGE
  • Ignition OFF.
  • Disconnect High Voltage Battery Coolant Temperature Sensor C4456 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4456-1   C4456-2

Is the voltage between 4.9V - 5.1V?
Yes GO to U11
No GO to U3

U3 CHECK THE COOLANT TEMPERATURE CIRCUITS FOR BEING SHORTED TO VOLTAGE
  • Ignition OFF.
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4456-1   Ground
      C4456-2   Ground

Is any voltage present?
Yes REPAIR the affected circuit.
No GO to U4

U4 CHECK THE COOLANT TEMPERATURE CIRCUITS FOR BEING SHORTED TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4456-1   Ground
      C4456-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to U5
No REPAIR the affected circuit.

U5 CHECK THE COOLANT TEMPERATURE CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4456-1   C4456-2

Is the resistance greater than 10,000 ohms?
Yes GO to U6
No REPAIR the circuits.

U6 CHECK THE COOLANT TEMPERATURE CIRCUITS FOR BEING OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4456-1 C3733-3 (female side)
      C4456-2 C3733-24 (female side)

Is the resistance less than 3 ohms?
Yes GO to U7
No REPAIR the affected circuit.

U7 CHECK THE COOLANT TEMPERATURE CIRCUITS INSIDE THE HIGH VOLTAGE BATTERY FOR BEING SHORTED
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-3 (male side) C3733-25 (male side)
    C3733-3 (male side) C3733-5 (male side)
    C3733-24 (male side) C3733-5 (male side)
    C3733-3 (male side) C3733-24 (male side)

Are the resistances greater than 10,000 ohms?
Yes GO to U11
No GO to U8

U8 CHECK THE COOLANT TEMPERATURE CIRCUITS INSIDE THE HIGH VOLTAGE BATTERY FOR BEING SHORTED TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-12 CASE GROUND
      C4237A-7 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to U9
No INSTALL a new wiring harness.

U9 CHECK THE COOLANT TEMPERATURE CIRCUITS INSIDE THE HIGH VOLTAGE BATTERY FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-12   C4237A-7

Is the resistance greater than 10,000 ohms?
Yes GO to U10
No INSTALL a new wiring harness.

U10 CHECK THE COOLANT TEMPERATURE CIRCUITS INSIDE THE HIGH VOLTAGE BATTERY FOR BEING OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-3 (male side)   C4237A-12
    C3733-24 (male side)   C4237A-7

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL new wiring harness.

U11 MEASURE THE COOLANT TEMPERATURE SENSOR RESISTANCE

NOTE: Allow the vehicle to set for minumum of 2 hours to allow the high voltage battery coolant termpture to reach ambient temperature.

  • Measure:
    Positive Lead Measurement / Action Negative Lead
    C444-1 (component side) C444-2 (component side)

    Click to display connectors
    Temperature Range Resistance Range
    -30C (-22F) to -20C (-4F) 276,959 ohms - 533,255 ohms
    -20C (-4F) to -10C (14F) 160,313 ohms - 276,959ohms
    -10C (14F) - 0C (32F) 95,851 ohms - 160,313 ohms
    0C (32F) - 10C (51F) 58,957 ohms - 95,851ohms
    10C (50F) - 20C (68F) 37,340 ohms - 58,957 ohms
    20C (68F) - 30C (86F) 24,253 ohms - 37,340 ohms
    30C (86F) - 40C (104F) 16,113 ohms - 24,253 ohms
    40C (104F) - 50C (122F) 10,926 ohms - 16,113 ohms
    50C (122F) - 60C (122F) 7,171 ohms - 10,926 ohms

Is the resistance value correct for the temperature?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new high voltage battery coolant temperature sensor.
REFER to: High Voltage Battery Coolant Temperature Sensor (303-14D Electric Powertrain Control, Removal and Installation).

PINPOINT TEST V: P0ABB:00, P0ABC:00, P0ABD:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors battery pack voltage at various points inside the high voltage battery. If a difference between the voltage measurements exceed a calibrated range or if a circuit fault is detected with one or more of the voltage measurements the following Diagnostic Trouble Codes (DTCs) will set. .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0ABB:00 Hybrid/EV Battery Pack 'A' Voltage Sense 'A' Circuit Range/Performance: No Sub Type Information Sets when BECM detects the difference between the positive voltage measurement from the sum of the high voltage battery cells and the positive full battery high voltage measurement is beyond a calibrated range for a calibrated amount of time.
BECM P0ABC:00 Hybrid/EV Battery Pack 'A' Voltage Sense 'A' Circuit Low: No Sub Type Information Sets when BECM detects a circuit voltage measurement of less than a calibrated threshold for a calibrated amount of time.
BECM P0ABD:00 Hybrid/EV Battery Pack 'A' Voltage Sense 'A' Circuit High: No Sub Type Information Sets when BECM detects a circuit voltage measurement of greater than a calibrated threshold for a calibrated amount of time.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage cables
  • BECM
  • Direct Current/Direct Current (DC/DC) converter control module
  • SOBDMC
  • ACCM and A/C compressor assembly
  • High voltage battery
V1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) AND SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test and record the Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, clear the SOBDMC Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform SOBDMC self-test.

Do any Diagnostic Trouble Codes (DTCs) other than BECM P0ABB:00, P0ABC:00, and/or P0ABD:00 exist?
Yes REFER to the BECM DTC chart in this section and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No GO to V2

V2 CHECK BECM (BATTERY ENERGY CONTROL MODULE) BATTERY PACK VOLTAGE PID
  • Access the  BECM  and monitor the  HVBAT_V (V)  PID


Is the value greater than 184.8V?
Yes GO to V7
No GO to V3

V3 CHECK THE HIGH VOLTAGE CABLE ASSEMBLY FOR A SHORT
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Disconnect SOBDMC C199C .
  • Disconnect ACCM C1803B .
  • Disconnect Direct Current/Direct Current (DC/DC) converter control module C1457A .
  • Disconnect High Voltage Battery C4236D .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236D-1   C4236D-2
      C4236D-3   C4236D-4

Is the resistance greater than 10,000 ohms?
Yes GO to V4
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

V4 CHECK THE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER FOR A SHORT
  • Connect Direct Current/Direct Current (DC/DC) converter control module C1457A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236D-1   C4236D-2

Is the resistance greater than 1,000 ohms?
Yes GO to V5
No INSTALL a new Direct Current/Direct Current (DC/DC) converter control module.
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).

V5 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) FOR A SHORT
  • Disconnect Direct Current/Direct Current (DC/DC) converter control module C1457A .
  • Connect ACCM C1803B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236D-1   C4236D-2

Is the resistance greater than 1,000 ohms?
Yes GO to V6
No INSTALL a new ACCM and Electric Compressor assembly.
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).

V6 CHECK THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) FOR A SHORT
  • NOTE: This test is polarity dependent. If the polarity is reversed the light bulb will remain illuminated and lead to incorrect diagnoses. NOTE: The use of a 1157 bulb or equivalent incandescent test lamp rated for 1A of current is required for this test. Make the connections as shown:

When circuit is connected, does the light bulb turn on initially and then turns off completely or does the light bulb fail to illuminate at all?
Yes GO to V7
No If the light bulb remains illuminated continuously for both polarities INSTALL a new SOBDMC .
REFER to: Inverter System Controller [SOBDMC] (303-14D Electric Powertrain Control, Removal and Installation).

V7 INSTALL A NEW BECM (BATTERY ENERGY CONTROL MODULE)
  • Ignition OFF.
  • Depower the high voltage system (if not previously performed).
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • INSTALL a new BECM .
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0ABB:00, P0ABC:00 or P0ABD:00 retrieved?
Yes INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative BECM . The system is now operating correctly.

PINPOINT TEST W: P0AC0:00, P0AC1:00, P0AC2:00, P0AC3:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM measures current flow through the contactors using a current sensor mounted within the high voltage battery junction box. The BECM uses a 5-volt reference to the current sensors and measures the return voltage. This return voltage is translated into current flow by the BECM .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AC0:00 Hybrid/EV Battery Pack 'A' Current Sensor 'A' Circuit Range/Performance: No Sub Type Information Sets when BECM senses the signal voltage offset is outside the normal range for 1 second.
BECM P0AC1:00 Hybrid/EV Battery Pack 'A' Current Sensor 'A' Circuit Low: No Sub Type Information Sets when BECM senses the signal voltage is below threshold value for 1 second.
BECM P0AC2:00 Hybrid/EV Battery Pack 'A' Current Sensor 'A' Circuit High: No Sub Type Information Sets when BECM senses the signal voltage is above threshold value for for 1 second.
BECM P0AC3:00 Hybrid/EV Battery Pack 'A' Current Sensor 'A' Circuit Intermittent/Erratic: No Sub Type Information Sets when BECM senses the current sensor signal voltage is erratic for 0.5 second.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

W1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AC0:00 , P0AC1:00, P0AC2:00 and/or P0AC3:00 present?
Yes GO to W2
No The concern is not present at this time.

W2 CHECK CURRENT SENSOR CIRCUITS FOR A SHORT TO CASE GROUND

NOTICE: The high voltage battery junction box current sensor C4236C utilizes a 3-step design. 1. Pull outward on the connector relase tab.. 2. Depress the release tab. 2. While holding down the release tab pull the connector body outward.

  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Disconnect High Voltage Battery Junction Box C4236C .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236C-1 CASE GROUND
      C4236C-2 CASE GROUND
      C4236C-3 CASE GROUND

Are the resistances greater than 10,000 ohms?
Yes GO to W3
No INSTALL a new wiring harness.

W3 CHECK CURRENT SENSOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236C-1   C4237B-1
      C4236C-2   C4237B-2
      C4236C-3   C4237B-9

Are the resistances of the circuits less than 3 ohms?
Yes GO to W4
No INSTALL a new wiring harness.

W4 CHECK CURRENT SENSOR CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236C-1   C4236C-2
      C4236C-1   C4236C-3
      C4236C-2   C4236C-3

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
CLEAR the DTC(s). INSTALL the high voltage battery cover and the high voltage battery. Repower the high voltage system. REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Operate the system and repeat the self test. If the DTC(s) are present INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness.

PINPOINT TEST X: P0AD9:00, P0ADB:00, P0ADC:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactor to close which will supply power to the high-voltage vehicle systems. The BECM monitors the high voltage contactor control circuits for overcurrent, undercurrent, and open circuit faults. If a fault is detected the BECM will set a DTC . The stop safely hazard (red triangle) warning indicator illuminates and the vehicle will shut down and/or not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AD9:00 Hybrid/EV Battery Positive Contactor Control Circuit/Open GM: No Sub Type Information Sets when BECM senses the positive contactor control circuit is open for 1 second or more
BECM P0ADB:00 Hybrid/EV Battery Positive Contactor 'A' Control Circuit Low: No Sub Type Information Sets if BECM senses undercurrent on the positive contactor control circuit for 2 seconds or more.
BECM P0ADC:00 Hybrid/EV Battery Positive Contactor 'A' Control Circuit High: No Sub Type Information Sets if BECM senses overcurrent on the positive contactor control circuit for 20 milliseconds or more.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

X1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AD9:00 , P0ADB:00, and/or P0ADC:00 present?
Yes GO to X2
No The concern is not present at this time.

X2 CHECK CONTACTOR CIRCUITS FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Ignition OFF.
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236B-5 CASE GROUND
      C4236B-8 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to X3
No INSTALL a new wiring harness.

X3 CHECK CONTACTOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-5   C4237B-6
      C4236B-8 C3733-8 (male side)

Are the resistances less than 3 ohms?
Yes GO to X4
No INSTALL a new wiring harness.

X4 CHECK CONTACTOR CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-5   C4236B-8

Is the resistance greater than 10,000 ohms?
Yes GO to X5
No INSTALL a new wiring harness.

X5 CHECK THE CONTACTOR COIL RESISTANCE
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    C4236B-5 (component side) C4236B-8 (component side)
    • With the help of an assistant, repeatedly tap on top of the contactor relay (A) using a screwdriver.

Is the resistance between 15.8 - 24.9 ohms and steady?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST Y: P0ADD:00, P0ADF:00, P0AE0:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactor to close which will supply power to the high-voltage vehicle systems. The BECM monitors the negative contactor control circuits for overcurrent, undercurrent, and open circuit faults. If a fault is detected the BECM will set a DTC . The stop safely hazard (red triangle) warning indicator illuminates and the vehicle will shut down and/or not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0ADD:00 Hybrid/EV Battery Negative Contactor Control Circuit/Open: No Sub Type Information Sets when BECM senses the negative contactor control circuit is open for 1 second or more.
BECM P0ADF:00 Hybrid/EV Battery Negative Contactor 'A' Control Circuit Low: No Sub Type Information Sets if BECM senses undercurrent on the negative contactor control circuit for 2 seconds or more.
BECM P0AE0:00 Hybrid/EV Battery Negative Contactor 'A' Control Circuit High: No Sub Type Information Sets if BECM senses overcurrent on the negative contactor control circuit for 20 milliseconds or more.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Y1 RETRIEVE THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0ADD:00, P0ADF:00, and/or P0AE0:00 present?
Yes GO to Y2
No The concern is not present at this time.

Y2 CHECK CONTACTOR CIRCUITS FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Ignition OFF.
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236B-6 CASE GROUND
      C4236B-8 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to Y3
No INSTALL a new wiring harness.

Y3 CHECK CONTACTOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-6   C4237B-8
      C4236B-8 C3733-8 (male side)

Are the resistances less than 3 ohms?
Yes GO to Y4
No INSTALL a new wiring harness.

Y4 CHECK CONTACTOR CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-6   C4236B-8

Is the resistance greater than 10,000 ohms?
Yes GO to Y5
No INSTALL a new wiring harness.

Y5 CHECK THE CONTACTOR COIL RESISTANCE
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    C4236B-6 (component side) C4236B-8 (component side)
    • With the help of an assistant, repeatedly tap on top of the contactor relay (A) using a screwdriver.

Is the resistance between 15.8 - 24.9 ohms and steady?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST Z: P0C78:00, P2C89:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the precharge contactor to close. During the contactor close sequence the pre-charge contactor closes first to limit the amount of inrush current flow prior to closure of the main contactors, which will supply high-voltage power to the vehicle. If the precharge contactor fails to close the main contactors cannot be closed. If this fault condition is sensed by the BECM , the stop safely hazard (red triangle) warning indicator is illuminated and the vehicle will not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P2C89:00 Hybrid/EV Battery System Precharge 'A' Current Too High: No Sub Type Information Fault sets in the BECM when the precharge contactor attempts to close and current flow exceeds 10A for 50 milliseconds. This could indicate a short in the high voltage system.
BECM P0C78:00 Hybrid/EV Battery System Precharge 'A' Time Too Long: No Sub Type Information Fault sets in the BECM when the precharge contactor is commanded closed and contactor voltage sense circuit indicates it has not closed for 600 milliseconds.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage cable assembly
  • Direct Current/Direct Current (DC/DC) converter control module
  • SOBDMC
  • ACCM and Electric Compressor assembly
  • High voltage battery junction box
  • BECM
  • Severely discharged high voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Z1 RETRIEVE AND RECORD THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0AE4:00, P0AE6:00, and/or P0AE7:00 present?
Yes GO to Pinpoint Test AA
No GO to Z2

Z2 CLEAR BECM (BATTERY ENERGY CONTROL MODULE) DTCS AND REPEAT SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • IGNITION OFF for a minimum of 5 minutes.
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0C78:00 and/or P2C89:00 present?
Yes GO to Z3
No The concern is not present at this time.

Z3 CHECK THE HIGH VOLTAGE BATTERY CABLE FOR BEING SHORTED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Disconnect High Voltage Battery C4236D .
  • Disconnect SOBDMC C199C .
  • Disconnect DC/DC Converter Control Module C1457A .
  • Disconnect ACCM C1803B .
  • Take measurements while performing a wiggle test of the high-voltage cable assembly.
    Click to display connectors

      High Voltage Battery


    Positive Lead Measurement / Action Negative Lead
    C4236D-1 (female side) C4236D-2 (female side)
    C4236D-1 (female side) C4236D-3 (female side)
    C4236D-2 (female side) C4236D-4 (female side)
    C4236D-3 (female side) C4236D-4 (female side)

    Click to display connectors

      DCDC


    Positive Lead Measurement / Action Negative Lead
      C1457A-1   C1457A-4

Are the resistances greater than 400,000 ohms?
Yes GO to Z4
No INSTALL a new high voltage battery cable.
REFER to: High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
Repower the high voltage system. REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Operate the system performing at least 2 ignition cycles to determine if the concern is still present. If the concern is still present, GO to Z4

Z4 TEST THE SYSTEM WITH THE ACCM (AIR CONDITIONING CONTROL MODULE) AND DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTROL MODULE ISOLATED

NOTE: Cover the high voltage connectors with electrical tape to prevent accidental exposure to high voltage.

  • Connect High Voltage Battery C4236D .
  • Connect SOBDMC C199C .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • IGNITION OFF for a minimum of 5 minutes.
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P2C89:00 and/or P0C78:00 retrieved?
Yes GO to Z6
No GO to Z5

Z5 TEST THE SYSTEM WITH THE ACCM (AIR CONDITIONING CONTROL MODULE) ISOLATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Connect DC/DC Converter Control Module C1457A .
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • IGNITION OFF for a minimum of 5 minutes.
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P2C89:00 and/or P0C78:00 retrieved?
Yes INSTALL a new DC/DC Converter Control Module.
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).
No INSTALL a new ACCM .
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).

Z6 CHECK THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) FOR A SHORT
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Disconnect SOBDMC C199C .
  • NOTE: This test is polarity dependent. If the polarity is reversed the light bulb will remain illuminated and lead to incorrect diagnoses. NOTE: The use of a 1157 bulb or equivalent incandescent test lamp rated for 1A of current is required for this test. Make the connections as shown:

When circuit is connected, does the light bulb turn on initially and then turns off completely or does the light bulb fail to illuminate at all?
Yes GO to Z7
No If the light bulb remains illuminated continuously for both polarities INSTALL a new SOBDMC .
REFER to: Inverter System Controller [SOBDMC] (303-14D Electric Powertrain Control, Removal and Installation).

Z7 INSTALL A NEW BECM (BATTERY ENERGY CONTROL MODULE)
  • INSTALL a new BECM .
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • IGNITION OFF for a minimum of 5 minutes.
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P2C89:00 and/or P0C78:00 retrieved?
Yes INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative BECM . The system is now operating correctly.

PINPOINT TEST AA: P0AE4:00, P0AE6:00, P0AE7:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the BECM makes various vehicle checks. If these checks are normal, the BECM sends a signal to the contactor to close, which will supply high-voltage power to the vehicle. The BECM monitors the precharge contactor control circuits for overcurrent, undercurrent, and open circuit faults. The BECM will illuminate the powertrain malfunction (wrench) indicator and MIL when the fault condition is present. For DTC P0AE4:00 and P0AE6:00 the vehicle will shut down and/or not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AE4:00 Hybrid/EV Battery Precharge Contactor Control Circuit 'A' Open: No Sub Type Information Sets when BECM senses the precharge contactor control circuit is open for 1 second or more.
BECM P0AE6:00 Hybrid/EV Battery Precharge Contactor Control Circuit 'A' Low: No Sub Type Information Sets if BECM senses undercurrent on the precharge contactor control circuit for 400 milliseconds or more.
BECM P0AE7:00 Hybrid/EV Battery Precharge Contactor Control Circuit 'A' High: No Sub Type Information Sets if BECM senses overcurrent on the precharge contactor control circuit for 20 milliseconds or more.

Possible Sources

  • Wiring, terminals or connectors
  • High voltage battery junction box
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AA1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using a diagnostic scan tool, perform BECM self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0AE4:00, P0AE6:00, and/or P0AE7:00?
Yes If DTC U3012:00 is present, REFER to the BECM DTC Chart and diagnose the DTC first. If U3012:00 DTC is NOT present, GO to AA2
No The concern is not present at this time.

AA2 CHECK CONTACTOR CIRCUITS FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236B-7 CASE GROUND
      C4236B-8 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to AA3
No INSTALL a new wiring harness.

AA3 CHECK CONTACTOR CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-7   C4236B-8

Is the resistance greater than 10,000 ohms?
Yes GO to AA4
No INSTALL a new wiring harness.

AA4 CHECK CONTACTOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236B-7   C4237B-20
      C4236B-8 C3733-8 (male side)

Are the resistances less than 3 ohms?
Yes GO to AA5
No INSTALL a new wiring harness.

AA5 CHECK THE CONTACTOR COIL RESISTANCE
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    C4236B-7 (component side) C4236B-8 (component side)

Is the resistance between 31.2 - 52 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new high voltage battery junction box.
REFER to: High Voltage Battery Junction Box - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST AB: P0AFB:00, P0C30:00

Normal Operation and Fault Conditions

The electrical system is monitored by the BECM . As the voltage is used in the high voltage battery, a request to charge the battery is sent on the HS-CAN to the PCM to send voltage to the battery to charge the battery and bring the operating voltage back to peak operating conditions. If the voltage of an individual or group of cells becomes too high, an over-charge condition is indicated. When battery voltage is too high, the stop safely hazard (red triangle) warning indicator is illuminated and the high voltage battery will shutdown impacting electric motor propulsion.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AFB:00 Hybrid/EV Battery System Voltage High: No Sub Type Information Sets if BECM senses the high voltage battery voltage is high for 10 seconds or more.
BECM P0C30:00 Hybrid/EV Battery Pack State of Charge High: No Sub Type Information Sets if BECM senses the max state of charge is equal to 100% for 15 seconds or max module voltage is greater than 4.45V for 1 second.

Possible Sources

  • BECM
AB1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test and record the Diagnostic Trouble Codes (DTCs).

Is DTC P0AFB:00 and/or P0C30:00 present?
Yes If other Diagnostic Trouble Codes (DTCs) are present REFER to the BECM DTC Chart and diagnose the Diagnostic Trouble Codes (DTCs) first. If other Diagnostic Trouble Codes (DTCs) are NOT present, CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No Attempt to duplicate the concern by performing a road test.

PINPOINT TEST AC: P0AFD:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition in the ON position and the engine ON or OFF, the BECM monitors and maintains the high voltage battery temperature in a specific range. A coolant temperature sensor is mounted in the high voltage battery coolant inlet hose that monitors coolant inlet temperature along with thermistors inside the high voltage battery cell arrays that monitor temperature. The high voltage battery is not designed to operate in temperatures below -40°C (-40°F).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0AFD:00 Hybrid/EV Battery Pack Temperature Too Low: No Sub Type Information Fault code sets if BECM detects a thermistor within the battery senses temperature inside the battery is -40°C (-40°F) for 100 milliseconds.

Possible Sources

  • External environmental temperatures
  • BECM
  • High voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AC1 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, perform BECM self-test.

Is DTC PADF:00 present?
Yes GO to AC2
No The concern was the result of external environmental temperatures or an intermittent thermistor or thermistor circuit fault. Consult with customer to determine if vehicle was exposed to extreme cold ambient air temperatures.

AC2 MEASURE THERMISTOR RESISTANCE FROM BECM (BATTERY ENERGY CONTROL MODULE)
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237C-9   C4237C-10
      C4237C-12   C4237C-13
      C4237C-15   C4237C-16
      C4237D-9   C4237D-10
      C4237D-12   C4237D-13
      C4237D-15   C4237D-16

    Click to display connectors
    Temperature Range Resistance Range
    -30C (-22F) to -20C (-4F) 320,166 ohms - 583,484 ohms
    -20C (-4F) to -10C (14F) 182,536 ohms - 320,166 ohms
    -10C (14F) - 0C (32F) 185,536 ohms - 107,769 ohms
    0C (32F) - 10C (51F) 107,769 ohms - 65,692 ohms
    10C (50F) - 20C (68F) 65,692 ohms - 41,231 ohms
    20C (68F) - 30C (86F) 41,231 ohms - 26,582 ohms
    30C (86F) - 40C (104F) 26,582ohms - 17,566 ohms
    40C (104F) - 50C (122F) 17,566 ohms - 11,874 ohms

Are the resistance values correct for the temperature?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST AD: P0B3B:00, P0B40:00, P0B45:00, P0B4A:00, P0B4F:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors voltage of the high voltage battery cell voltages. The BECM measures individual battery cells within the battery and monitors them for circuit faults. If the BECM senses a fault the (red triangle) warning indicator, MIL are both illuminated and the vehicle will shut down and/or not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0B3B:00 Hybrid/EV Battery Voltage Sense 'A' Circuit: No Sub Type Information Sets when BECM detects one cell module voltage is faulted.
BECM P0B40:00 Hybrid/EV Battery Voltage Sense 'B' Circuit: No Sub Type Information Sets when BECM detects one cell module voltage is faulted.
BECM P0B45:00 Hybrid/EV Battery Voltage Sense 'C' Circuit: No Sub Type Information Sets when BECM detects one cell module voltage is faulted.
BECM P0B4A:00 Hybrid/EV Battery Voltage Sense 'D' Circuit: No Sub Type Information Sets when BECM detects one cell module voltage is faulted.
BECM P0B4F:00 Hybrid/EV Battery Voltage Sense 'E' Circuit: No Sub Type Information Sets when BECM detects one cell module voltage is faulted.

Possible Sources

  • Unseated BECM connectors
  • BECM
  • High voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AD1 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using the scan tool, perform BECM self-test.

Is DTC P0B3B:00, P0B40:00, P0B45:00, P0B4A:00 and/or P0B4F:00 present?
Yes GO to AD2
No The concern is not present at this time.

AD2 INSPECT THE BECM (BATTERY ENERGY CONTROL MODULE) CONNECTORS
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Inspect the BECM connectors and make sure they are fully seated.
  • If the connectors are fully seated DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Inspect connectors no. 5 - 8 and the BECM pins for:
  • For:
    • corrosion
    • damaged or bent pins
    • pushed-out pins

Were all the BECM connectors fully seated and free of any concerns during inspection?
Yes GO to AD4
No If the connectors were NOT fully seated reseat the connector(s). GO to AD3 If wiring harness connector or pin concerns are present install new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

AD3 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • INSTALL the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • INSTALL the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is a high voltage battery voltage sense circuit DTC retrieved?
Yes GO to AD4
No Repair is complete.

AD4 INSTALL A NEW BECM (BATTERY ENERGY CONTROL MODULE)
  • CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • CONNECT all the BECM connectors.
  • INSTALL the high voltage battery cover and the high voltage battery.
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is a high voltage battery voltage sense circuit DTC retrieved?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative BECM . The system is now operating correctly.

PINPOINT TEST AE: P0BB3:00, P0BB4:00, P0BB8:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

The BECM monitors sense circuits downstream of the contactors to verify if they open and close correctly. The sense circuits are monitored for faults. The powertrain malfunction (wrench) indicator and MIL is illuminated when a fault is present.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0BB3:00 Hybrid/EV Battery Voltage Sense 'Y' Circuit: No Sub Type Information Sets when the positive contactor is closed and the BECM detects the positive contactor sense circuit voltage is out of range high or low for 1 second.
BECM P0BB4:00 Hybrid/EV Battery Voltage Sense 'Y' Circuit Range/Performance: No Sub Type Information Sets when the positive and negative contactors are closed and the BECM detects the positive contactor sense circuit voltage is beyond a calibrated threshold compared to the battery pack voltage for 5 seconds.
BECM P0BB8:00 Hybrid/EV Battery Voltage Sense 'Z' Circuit: No Sub Type Information Sets when the negative contactor is closed and the BECM detects the negative contactor sense circuit voltage is out of range high or low for 1 second.

Possible Sources

  • Wiring, terminals or connectors
  • BECM
  • Severely discharged high voltage battery
  • High voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AE1 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Operate the system performing at least 2 ignition cycles.
  • Using the scan tool, perform BECM self-test.

Is DTC P0BB3:00, P0BB4:00 and/or P0BB8:00 present?
Yes GO to AE2
No The concern is not present at this time.

AE2 CHECK CONTACTOR VOLTAGE SENSE CIRCUITS FOR A SHORT TO CASE GROUND
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Depower the high voltage battery junction box by disconnecting C4236E
  • Depower the high voltage battery junction box by disconnecting C4236F
  • Disconnect High Voltage Battery Junction Box C4236A .
  • Disconnect Inline (positive contactor voltage sense) C4239B .
  • Disconnect Inline (negative contactor voltage sense) C4239A .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4236A-1 CASE GROUND
      C4236A-8 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to AE3
No INSTALL a new wiring harness.

AE3 CHECK CONTACTOR VOLTAGE SENSE CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236A-1   C4239B-1
      C4236A-8   C4239A-1

Is the resistance less than 3 ohms?
Yes GO to AE4
No INSTALL a new wiring harness.

AE4 CHECK CONTACTOR VOLTAGE CIRCUITS FOR BEING SHORTED TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236A-1   C4236A-8

Is the resistance greater than 10,000 ohms?
Yes GO to AE5
No INSTALL a new wiring harness.

AE5 INSTALL A NEW BECM (BATTERY ENERGY CONTROL MODULE)
  • CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • CONNECT all the connectors.
  • INSTALL the high voltage battery cover and the high voltage battery.
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0BB3:00, P0BB4:00 and/or P0BB8:00 retrieved?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was caused by an inoperative BECM . The system is now operating correctly.

PINPOINT TEST AF: U3012:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on, the PCM sends a signal via low side driver to close the contactor relay located in the BCMC . The contactor relay sends a 12-volt supply voltage to the BECM and the high voltage battery junction box. The BECM monitors the contactor control supply circuit for faults. If this voltage is low or drops while the contactor close request message is being received via the HS-CAN, DTC U3012:00 sets. If a fault is detected the BECM requests the stop stop safely hazard (red triangle) warning indicator illuminates and the high voltage battery will shutdown impacting electric motor propulsion and/or the vehicle will not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U3012:00 Control Module Improper Wake-up Performance: No Sub Type Information Sets when BECM senses the contactor control supply circuit voltage is low while the contactor close request is being received for 1 second.

Possible Sources

  • 12-volt battery
  • Fuse(s)
  • Wiring, terminals or connectors
  • BCMC
  • BECM
  • SOBDMC

Visual Inspection and Pre-checks

  • Inspect the low voltage service disconnect for being connected.

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AF1 CLEAR THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS AND REPEAT THE SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U3012:00 present?
Yes GO to AF2
No The concern is not present at this time and may have been related to the service disconnect being disconnected.

AF2 CHECK THE CONTACTOR RELAY AND CIRCUITS OPERATION
  • Ignition OFF.
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3733-8   Ground
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3733-8   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the ignition ON and 0V with the ignition OFF?
Yes GO to AF13
No GO to AF3

AF3 INSPECT THE LOW VOLTAGE SERVICE DISCONNECT FOR BEING FULLY SEATED
  • Inspect the service disconnect C1001 for being fully seated.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).

Is the service disconnect fully seated?
Yes GO to AF5
No Reseat the service disconnect. GO to AF4

AF4 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U3012:00 present?
Yes GO to AF5
No The concern is not present at this time and/or was the result of the service disconnect not being fully seated.

AF5 CHECK THE CONTACTOR RELAY AND CIRCUITS OPERATION USING A FUSED JUMPER
  • Disconnect SOBDMC C199A .
  • Connect a 5A fused jumper between:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C199A-12   Ground
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3733-8   Ground
  • Disconnect the 5A fused jumper.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3733-8   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the fused jumper connected and 0V with the fused jumper disconnected?
Yes GO to AF6
No GO to AF7

AF6 CHECK FOR SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Using a diagnostic scan tool, perform SOBDMC self-test.

Are any DTC s present?
Yes ADDRESS the SOBDMC DTC s.
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SOBDMC .
REFER to: Inverter System Controller [SOBDMC] (303-14D Electric Powertrain Control, Removal and Installation).

AF7 CHECK THE CONTACTOR RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BCMC C1002 .
  • Disconnect SOBDMC C199A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1002-12   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to AF8

AF8 CHECK THE CONTACTOR RELAY CONTROL CIRCUIT SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1002-12   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to AF9
No REPAIR the circuit.

AF9 CHECK THE CONTACTOR RELAY CONTROL CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1002-12   C199A-12

Is resistance less than 3 ohms?
Yes GO to AF10
No REPAIR the circuit.

AF10 CHECK THE CONTACTOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-8 (female side)   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to AF11

AF11 CHECK THE CONTACTOR SUPPLY CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-8 (female side)   C1002-31

Is the resistance less than 3 ohms?
Yes GO to AF13
No REPAIR the circuit.

AF12 CHECK THE CONTACTOR RELAY OPERATION
  • Connect a 5A fused jumper between:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C1002 - 21 (component side) 12V BATTERY POST (B+)

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C1002 - 12 (component side)   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C1002 - 31 (component side)   Ground
  • Disconnect the 5A fused ground jumper.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C1002 - 31 (component side)   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the fused jumpers connected and 0V with the fused ground jumper disconnected?
Yes The concern may have been caused by connections. Address the root casue of any connector or pin issues.
No INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).

AF13 CHECK THE CONTACTOR SUPPLY CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY FOR BEING SHORTED TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Disconnect High Voltage Battery Junction Box C4236B .
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237A-10 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to AF14
No INSTALL a new wiring harness.

AF14 CHECK THE CONTACTOR SUPPLY CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY FOR BEING OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-10 C3733-8 (male side)

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness.

PINPOINT TEST AG: U301B:00, U301C:00

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned on the SOBDMC also known as the Inverter System Controller (ISC) supplies a 12-volt wake-up signal to the BECM , DCDC , PCM . The BECM monitors the wake-up circuit for faults setting a DTC . The following Diagnostic Trouble Codes (DTCs) will illuminate the powertrain malfunction (wrench) indicator.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U301B:00 Control Module Wake-up Circuit 'A' Low: No Sub Type Information Sets when the BECM wake-up output signal does not match the command.
BECM U301C:00 Control Module Wake-up Circuit 'A' High: No Sub Type Information Sets when the BECM wake-up output signal does not match the command.

Possible Sources

  • Wiring, terminals or connectors
  • Direct Current/Direct Current (DC/DC) converter control module
  • SOBDMC
  • PCM
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AG1 CHECK SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DTCS
  • Ignition ON.
  • Using the scan tool, perform SOBDMC self-test.

Is DTC P2531:00 present?
Yes
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
No GO to AG2

AG2 CLEAR THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS AND REPEAT THE SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U301B:00 or U301C:00 present?
Yes GO to AG3
No The concern is not present at this time.

AG3 CHECK THE WAKEUP CIRCUIT VOLTAGE
  • Ignition OFF.
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the ignition ON and 0V with the ignition OFF?
Yes GO to AG10
No GO to AG4

AG4 CHECK THE WAKEUP CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect SOBDMC C199A .
  • Disconnect Direct Current/Direct Current (DC/DC) converter control module C1457B .
  • Disconnect PCM C175B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is there any voltage present?
Yes REPAIR the circuit.
No GO to AG5

AG5 CHECK THE WAKEUP CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to AG6
No REPAIR the circuit.

AG6 CHECK THE WAKEUP CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C199A-3 C3733-1 (female side)

Is the resistance less than 3 ohms?
Yes GO to AG7
No REPAIR the circuit.

AG7 CHECK THE WAKEUP VOLTAGE WITH THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) CONNECTED
  • Connect SOBDMC C199A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the ignition ON and 0V with the ignition OFF?
Yes GO to AG8
No Perform the SOBDMC pinpoint test for DTC U301B:00.
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).

AG8 CHECK THE WAKEUP VOLTAGE WITH THE DC/DC CONVERTER CONNECTED
  • Connect Direct Current/Direct Current (DC/DC) converter control module C1457B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the ignition ON and 0V with the ignition OFF?
Yes GO to AG9
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new DCDC .
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).

AG9 CHECK THE WAKEUP VOLTAGE WITH THE PCM (POWERTRAIN CONTROL MODULE) CONNECTED
  • Connect PCM C175B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-1 (female side)   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery with the ignition ON and 0V with the ignition OFF?
Yes GO to AG10
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)

AG10 CHECK THE WAKEUP CIRCUIT INSIDE THE BATTERY PACK FOR A SHORT TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237A-20 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to AG11
No INSTALL a new wiring harness.

AG11 CHECK THE WAKEUP CIRCUIT INSIDE THE BATTERY PACK FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-20 C3733-1 (male side)

Is the resistance greater less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness.

PINPOINT TEST AH: P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00, P2CF3:00

Refer to Wiring Diagrams Cell 21 for schematic and connector information.

Normal Operation and Fault Conditions

The high voltage battery coolant pump is an electric coolant pump is controlled by the BECM and circulates coolant through the high voltage battery. The BECM monitors the electric water pump and circuits for faults setting a DTC . The following Diagnostic Trouble Codes (DTCs) will illuminate the MIL .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0C48:00 Hybrid/EV Battery Pack Coolant Pump 'A' Control Circuit Low: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the control circuit is open or shorted to ground.
BECM P0C49:00 Hybrid/EV Battery Pack Coolant Pump 'A' Control Circuit High: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the control circuit is shorted to 12-volt battery.
BECM P0C4A:00 Hybrid/EV Battery Pack Coolant Pump 'A' Control Performance: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates lost communication with the pump for.
BECM P0C4B:00 Hybrid/EV Battery Pack Coolant Pump 'A' Supply Voltage Circuit/Open: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the coolant pump power supply is under/overvoltage for.
BECM P0CFF:00 Hybrid/EV Battery Pack Coolant Pump 'A' Stuck/Stalled: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the coolant pump motor stuck/stalled fault has occurred.
BECM P0E1F:00 Hybrid/EV Battery Pack Coolant Pump 'A' Control Circuit Driver Current/Temperature Too High: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the coolant pump over temperature or internal error has occurred.
BECM P2B29:00 Hybrid/EV Battery Pack Coolant Pump 'A' Overspeed /Air in System: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the coolant pump dry-run error has occurred.
BECM P2CF3:00 Hybrid/EV Battery Pack Coolant Pump 'A' Underspeed: No Sub Type Information This DTC sets when the feedback signal the BECM receives from the high voltage battery coolant pump indicates the coolant pump impeller speed below minimum speed error has occurred.

Possible Sources

  • Wiring, terminals or connectors
  • Low coolant level
  • Air in the cooling system
  • High voltage battery coolant pump
  • BCMC
  • BECM
AH1 ACTIVE COMMAND THE COOLANT PUMP AND PERFORM THE BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.
  • RECORD the Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration if the affected coolant pump is accessible.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U3012:00, P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00 and/or P2CF3:00 present, or is the coolant pump not running?
Yes For DTC U3012:00, GO to Pinpoint Test AF For DTC P2B29:00, GO to AH2 For Diagnostic Trouble Codes (DTCs) P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P2CF3:00 or if the coolant pump is not running, GO to AH4 For Diagnostic Trouble Codes (DTCs) P0E1F:00, INSTALL a new high voltage battery coolant pump.
REFER to: High Voltage Battery Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to AH14
No CHECK for an intermittent fault condition. GO to AH17

AH2 CHECK THE ELECTRIC POWERTRAIN COOLING SYSTEM COOLANT LEVEL
  • Park the vehicle on a level surface and allow to cool to ambient temperature.
  • Visually inspect the electric powertrain cooling system coolant level.

Is the electric powertrain coolant level within specifications?
Yes GO to AH3
No MEASURE and RECORD the coolant level from the MIN line. ADJUST the electric powertrain coolant level as necessary. Pressure test the engine cooling system and address any coolant leaks.
REFER to: Electric Powertrain Cooling (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Diagnosis and Testing).
GO to AH3

AH3 PERFORM THE COOLING SYSTEM FILL ROUTINE
  • Ignition ON.
  • CONNECT the diagnostic tool.
  • Using a diagnostic scan tool, perform the cooling system fill routine and verify if the affected coolant pump is running by feeling the pump for vibration.
    REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03C Engine Cooling, General Procedures).
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration if the affected coolant pump is accessible.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00 and/or P2CF3:00 present, or is the coolant pump not running?
Yes For Diagnostic Trouble Codes (DTCs) P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P2CF3:00 or if the coolant pump is not running, GO to AH4 For DTC P2B29:00, REPEAT pinpoint test AG4, if the DTC is still present, INSTALL a new high voltage battery coolant pump.
REFER to: High Voltage Battery Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to AH14 For DTC P0E1F:00, INSTALL a new high voltage battery coolant pump.
REFER to: High Voltage Battery Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to AH14
No The repair is complete.

AH4 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP AND HIGH VOLTAGE BATTERY ELECTRICAL CONNECTORS
  • Disconnect High Voltage Battery Coolant Pump C1721 .
  • Disconnect High Voltage Battery C3733 .
  • Inspect for:
    • corrosion
    • damaged or bent pins
    • pushed-out pins

Are any concerns present?
Yes REPAIR the wiring and/or connector concern. Clear the BECM DTC's. Repeat the self-test.
No GO to AH5

AH5 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP B+ CIRCUIT
  • Ignition ON.
  • Measure and record:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    12V BATTERY POST (B+) 12V BATTERY POST (B˗)
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-2   Ground

Is voltage within 0.5V of the voltage measured at the 12V battery?
Yes GO to AH8
No GO to AH6

AH6 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP B+ CIRCUIT FOR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BCMC C1002 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to AH7
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

AH7 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP B+ CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-2   C1002-18

Is resistance less than 3 ohms?
Yes INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
Clear the BECM DTC's. Repeat the self-test
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

AH8 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CHASSIS GROUND AND CIRCUIT
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-1 12V BATTERY POST (B+)

Is voltage within 0.5V of the voltage measured at the 12V battery?
Yes GO to AH9
No Remove G107 and clean mounting surface. Reinstall the ground bolt and repeat the test step. If the concern remains REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

AH9 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect High Voltage Battery C3733 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-3   Ground

Is there any voltage present?
Yes REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.
No GO to AH10

AH10 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-3   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to AH11
No REPAIR the circuit. Clear the BECM DTC's. Repeat the self-test.

AH11 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CONTROL CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-3 C3733-19 (female side)

Is the resistance less than 3 ohms?
Yes GO to AH12
No REPAIR the circuit in question. Clear the BECM DTC's. Repeat the self-test.

AH12 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1721-1   C1721-2
      C1721-1   C1721-3
      C1721-2   C1721-3

Is the resistance greater than 10,000 ohms?
Yes GO to AH13
No REPAIR the circuits. Clear the BECM DTC's. Repeat the self-test.

AH13 LOAD TEST THE HIGH VOLTAGE BATTERY COOLANT PUMP B+ CIRCUIT
  • Ignition ON.
  • Measure:
    Click to display connectors

    NOTE: The use of a 1157 bulb or equivalent incandescent test lamp rated for 1A of current is required for this test.


    Positive Lead Measurement / Action Negative Lead
      C1721-2 12V BATTERY POST (B˗)

Does the light bulb illuminate brightly?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery coolant pump.
REFER to: High Voltage Battery Coolant Pump (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), Removal and Installation).
GO to AH14
No INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
Clear the BECM DTC's. GO to AH14

AH14 ACTIVE COMMAND THE COOLANT PUMP ON AND REPEAT BECM (BATTERY ENERGY CONTROL MODULE) SELF TEST
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100% for a minimum of 5 minutes.
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC P0C48:00, P0C49:00, P0C4A:00, P0C4B:00, P0CFF:00, P0E1F:00, P2B29:00 and/or P2CF3:00 present, or is the coolant pump not running?
Yes GO to AH15
No The vehicle concern has been repaired.

AH15 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CONTROL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR A SHORT TO CASE GROUND
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors

    NOTE: Any area of the machined surface can be utilized for case ground.


    Positive Lead Measurement / Action Negative Lead
      C4237A-13 CASE GROUND

Is the resistance greater than 10,000 ohms?
Yes GO to AH16
No INSTALL a new wiring harness. Repower the high voltage system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Clear the BECM DTC's. Repeat the self-test.

AH16 CHECK THE HIGH VOLTAGE BATTERY COOLANT PUMP CONTROL CIRCUIT INSIDE THE HIGH VOLTAGE BATTERY PACK FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4237A-13 C3733-19 (male side)

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No INSTALL a new wiring harness. Repower the high voltage system.
REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Clear the BECM DTC's. Repeat the self-test.

AH17 ACTIVE COMMAND THE COOLANT PUMP ON AND MONITOR THE COOLANT PUMP STATUS
  • Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • Using the scan tool, active command the coolant pump to 100%.
  • Access the  BECM  and monitor the  COOLPMP_A_STAT  PID

  • With the help of an assistant, perform a wiggle test on the coolant pump wiring harness while monitoring the coolant pump status PID .

Did the coolant pump status PID change to a fault status during the wiggle test?
Yes REPAIR the wiring and/or connector concern. Clear the BECM DTC's. Repeat the self-test.
No The concern is not present at this time.

PINPOINT TEST AI: P262B:00

Refer to Wiring Diagrams Cell 13 for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned off the BECM has in internal timer that monitors key off time. When the ignition is turned on the BECM monitors various inputs to determine if a key off timer malfunction exists. This DTC will illuminate the MIL .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P262B:00 Control Module Power Off Timer Performance: No Sub Type Information This DTC sets when the difference between the engine off time and the central processing unit (CPU) time exceeds a calibrated limit for a calibrated amount of time.

Possible Sources

  • Aftermarket accessories
  • 12-volt battery
  • 12-volt battery cables incorrect or intermittent connections
  • BECM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AI1 RETRIEVE ALL BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Are any Diagnostic Trouble Codes (DTCs) other than P262B:00 present?
Yes REFER to the BECM DTC Chart and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No GO to AI2

AI2 CHECK FOR AFTERMARKET ACCESSORIES
  • Inspect vehicle for installed aftermarket accessories.

Are any aftermarket accessories installed?
Yes Consult with customer that the aftermarket accessories could be causing the concern.
No GO to AI3

AI3 CHECK THE 12V BATTERY CABLE CONNECTIONS
  • Inspect the 12-volt battery cable connections.

Are the connections clean and tight?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No Repair the connections.

PINPOINT TEST AJ: HIGH VOLTAGE BATTERY PACK CELL BALANCING FAULTS

Normal Operation and Fault Conditions

The high voltage battery pack is consisted of multiple series-connected cells. To preserve battery life and insure the battery pack good performance, it is essential to minimize the deviations between individual cell state-of-charge (SOC). Cell balancing circuit, located inside BECM , is used to achieve the objective by closing the electric circuit to discharge the cells with high SOC. Cell Balancing occurs when the high voltage battery state-of-charge (SOC) is equal or greater than 15% and the ignition has been turned off for greater than 24 hours. When cell balancing circuit is stuck open or closed, the corresponding cells SOCs are higher or lower than the other cell SOCs, and the wrench indicator will illuminate. After BECM replacement, the cell balancing circuit stuck open or closed DTC might be returned because of the unbalanced cell SOCs, and cell re-balancing is necessary to resolve the fault symptom. The stop safely hazard (red triangle) warning indicator and MIL illuminates. For DTC's P0B24:00 electric motor propulsion will be limited reducing vehicle power.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM P0B24:00 Hybrid/EV Battery 'A' Voltage Unstable: No Sub Type Information Sets if one module cell voltage deviates from the average module cell voltage for 15 seconds. The powertrain malfunction (wrench) indicator and MIL illuminates and charging/discharging of the high voltage battery is limited.
BECM P0DAD:00 Hybrid/EV Battery Cell Balancing Circuit 'A' Stuck On: No Sub Type Information Sets if cell balance circuit A is stuck closed for 0.1 second.
BECM P0DAE:00 Hybrid/EV Battery Cell Balancing Circuit 'A' Stuck Off: No Sub Type Information Sets if cell balance circuit A is stuck open for 0.1 second.
BECM P0DB1:00 Hybrid/EV Battery Cell Balancing Circuit 'B' Stuck On: No Sub Type Information Sets if cell balance circuit B is stuck closed for 0.1 second.
BECM P0DB2:00 Hybrid/EV Battery Cell Balancing Circuit 'B' Stuck Off: No Sub Type Information Sets if cell balance circuit B is stuck open for 0.1 second.
BECM P0DB5:00 Hybrid/EV Battery Cell Balancing Circuit 'C' Stuck On: No Sub Type Information Sets if cell balance circuit C is stuck closed for 0.1 second.
BECM P0DB6:00 Hybrid/EV Battery Cell Balancing Circuit 'C' Stuck Off: No Sub Type Information Sets if cell balance circuit C is stuck open for 0.1 second.
BECM P0DB9:00 Hybrid/EV Battery Cell Balancing Circuit 'D' Stuck On: No Sub Type Information Sets if cell balance circuit D is stuck closed for 0.1 second.
BECM P0DBA:00 Hybrid/EV Battery Cell Balancing Circuit 'D' Stuck Off: No Sub Type Information Sets if cell balance circuit D is stuck open for 0.1 second.
BECM P0DBD:00 Hybrid/EV Battery Cell Balancing Circuit 'E' Stuck On: No Sub Type Information Sets if cell balance circuit E is stuck closed for 0.1 second.
BECM P0DBE:00 Hybrid/EV Battery Cell Balancing Circuit 'E' Stuck Off: No Sub Type Information Sets if cell balance circuit E is stuck open for 0.1 second.

Possible Sources

  • Low high voltage battery voltage
  • Wiring, terminals or connectors
  • BECM
  • High voltage battery

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

AJ1 RETRIEVE ALL THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, perform BECM self-test.

Is DTC P1A0F:68, P0C30:00, P0AFB:00, P0A7D:00, P0A7E:00, P0AFD:00, P0AD9:00, P0ADD:00, P0AA4:00, P0AA5:00, P0AA2:00, P0C78:00, P2C89:00, or U0300:00 present?
Yes REFER to the BECM DTC chart in this section and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No GO to AJ2

AJ2 CHARGE THE HIGH VOLTAGE BATTERY IN DRIVE MODE
  • Using a diagnostic scan tool, view BECM PIDs.
  • Access the  BECM  and monitor the  BATT_CHAR_[SOC] (%)  PID

    If the value is above 85% SOC discharge the high voltage battery until value is 80% or less by turning on electrical loads.
  • Start the engine. (Ready indicator light ON)
  • Wait until the SOC (State Of Charge) increases by 10% or more. The vehicle will charge the high voltage battery automatically.
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Are any of the following Diagnostic Trouble Codes (DTCs) retrieved: P0B24:00, P0DAD:00, P0DAE:00, P0DB1:00, P0DB2:00, P0DB5:00, P0DB6:00, P0DB9:00, P0DBA:00, P0DBD:00 or P0DBE:00?
Yes GO to AJ3
No The concern was corrected by charging the high voltage battery.

AJ3 CHECK BECM (BATTERY ENERGY CONTROL MODULE) CONNECTORS FOR BEING FULLY SEATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Inspect all BECM connectors, and make sure they are fully seated.

Were all the BECM connectors fully seated?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
GO to AJ4
No DISCONNECT all the BECM connectors and re-connect them in sequence.
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
. GO to AJ4

AJ4 CHECK BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • INSTALL the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • INSTALL the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Repower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Start the engine. (Ready indicator light ON)
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Are any of the following Diagnostic Trouble Codes (DTCs) retrieved: P0B24:00, P0DAD:00, P0DAE:00, P0DB1:00, P0DB2:00, P0DB5:00, P0DB6:00, P0DB9:00, P0DBA:00, P0DBD:00 or P0DBE:00?
Yes GO to AJ5
No The system is operating correctly at this time. The concern was resolved by reseating the BECM connectors.

AJ5 CHARGE THE HIGH VOLTAGE BATTERY IN DRIVE MODE
  • Ignition ON.
  • Start the engine. (Ready indicator light ON)
  • Wait 10 minutes. The vehicle will charge the high voltage battery automatically.
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Start the engine. (Ready indicator light ON)
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test.

Are any of the following Diagnostic Trouble Codes (DTCs) retrieved: P0B24:00, P0DAD:00, P0DAE:00, P0DB1:00, P0DB2:00, P0DB5:00, P0DB6:00, P0DB9:00, P0DBA:00, P0DBD:00 or P0DBE:00?
Yes GO to AJ6
No Repair is complete.

AJ6 ALLOW THE BECM (BATTERY ENERGY CONTROL MODULE) TO PERFORM CELL BALANCING
  • Ignition ON.
  • Access the  BECM  and monitor the  BATT_CHAR_[SOC] (%)  PID

  • Verify the Battery Pack State of Charge is greater than 10%. If the value is less than 10%, REPEAT pinpoint test step AI5.
  • Access the  BECM  and monitor the  HEV_BAT_VAR_V (V)  PID

  • RECORD the PID value.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF for a minimum of 24 hours.
  • Ignition ON.
  • Access the  BECM  and monitor the  HEV_BAT_VAR_V (V)  PID

  • RECORD the PID value. If the value is less than the reading recorded in step 5 repeat steps 1-9. If the value is not less than the reading recorded in step 5 proceed to step 10.
  • Using a diagnostic scan tool, perform BECM self-test and record the Diagnostic Trouble Codes (DTCs).

Are any of the following Diagnostic Trouble Codes (DTCs) retrieved: P0B24:00, P0DAD:00, P0DAE:00, P0DB1:00, P0DB2:00, P0DB5:00, P0DB6:00, P0DB9:00, P0DBA:00, P0DBD:00 or P0DBE:00?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new high voltage battery.
REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No Repair is complete.

PINPOINT TEST AK: U3003:16, U3003:17, U3003:64

Refer to Wiring Diagrams Cell 12 for schematic and connector information.

Normal Operation and Fault Conditions

During normal vehicle operation, the 12-volt battery supplies voltage to the BECM in order for the BECM to operate. If this voltage is low or not available, the BECM cannot function correctly. This fault will not illuminate a MIL or affect vehicle performance.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U3003:16 Battery Voltage: Circuit Voltage Below Threshold Sets if BECM 12-volt power source falls below 9 volts for at least 5 seconds.
BECM U3003:17 Battery Voltage: Circuit Voltage Above Threshold Sets if BECM 12-volt power source goes above 16 volts for at least 5 seconds.
BECM U3003:64 Battery Voltage: Signal Plausibility Failure Sets if BECM 12-volt power source goes above 25 volts or less than 2.5 volts for at least 2 seconds.

Possible Sources

  • 12-volt battery
  • Wiring, terminals or connectors
  • Direct Current/Direct Current (DC/DC) converter control module
  • BECM

Visual Inspection and Pre-checks

  • Inspect the 12-volt battery terminals for being clean and tight.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

AK1 CLEAR ALL CMDTCS AND REPEAT SELF TEST
  • Ignition ON.
  • Using a diagnostic scan tool, clear all All Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  • Start the engine. (Ready Indicator Light ON) for a minimum for 2 minutes.
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, perform a All Continuous Memory Diagnostic Trouble Codes (CMDTCs) self test.

Is DTC B1316:00, B1318:00, B1676:00, P0562:00, P0563:00, U3003:16 or U3003:17 present in more than 1 module?
Yes CARRY OUT self-test of the Direct Current/Direct Current (DC/DC) converter control module. If a DTC is present,
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
If the module passes a self test with no Diagnostic Trouble Codes (DTCs), GO to AK2
No If no Diagnostic Trouble Codes (DTCs) are present the concern is not present at this time. For DTC U3003:16 or U3003:17, GO to AK2 For DTC , U3003:64, GO to AK5

AK2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AK3
No INSTALL a 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AK3 CHECK THE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTROL MODULE VOLTAGE CONVERTER STATUS (DCDC_ENABLE) PID (PARAMETER IDENTIFICATION)
  • Using a diagnostic scan tool, view Direct Current/Direct Current (DC/DC) converter control module PIDs.
  • Monitor the DCDC_ENABLE PID .

Does the PID read Enable?
Yes GO to AK4
No Verify the high voltage battery service disconnect is installed and all other Diagnostics Trouble Codes (DTCs) have been addressed. For BECM Diagnostic Trouble Codes (DTCs), REFER to the DTC chart in this section.

AK4 MEASURE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTROL MODULE OUTPUT VOLTAGE
  • Start the engine. (Ready Indicator Light ON)
  • For DTC U3003:17, turn off all accessories for a minimum of 2 minutes.
  • For DTC U3003:16, turn on the headlamps and HVAC fan for a minimum of 2 minutes.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead

Is the voltage 13-14.9 volts?
Yes GO to AK5
No CARRY OUT self-test of the Direct Current/Direct Current (DC/DC) converter control module.
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).

AK5 COMPARE BATTERY VOLTAGE BECM (BATTERY ENERGY CONTROL MODULE) PID (PARAMETER IDENTIFICATION) MAIN ECU VOLTAGE SUPPLY (MAINECUV)
  • Using a diagnostic scan tool, view BECM PIDs.
  • Monitor the MAINECUV PID .

Does the PID read 8-16 volts?
Yes GO to AK9
No If the PID reads less than 8 volts or greater than 16 volts, GO to AK6

AK6 MEASURE BECM (BATTERY ENERGY CONTROL MODULE) INPUT VOLTAGE
  • Ignition OFF.
  • Disconnect High Voltage Battery C3733 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-5 (female side)   Ground
    C3733-6 (female side)   Ground

Are the BECM circuit voltages equal to 12-volt battery voltage?
Yes GO to AK7
No VERIFY BCMC F146 (15A) is OK. If the fuse is OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

AK7 CHECK BECM (BATTERY ENERGY CONTROL MODULE) GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-25 (female side)   Ground
    C3733-26 (female side)   Ground

Are the resistances less than 3 ohms?
Yes GO to AK8
No REPAIR the circuit.

AK8 CHECK BECM (BATTERY ENERGY CONTROL MODULE) B+ INPUT AND GROUND CIRCUITS INSIDE THE BATTERY PACK
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover and DISCONNECT all the BECM connectors in sequence.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    C3733-5 (male side)   C4237A-9
    C3733-6 (male side)   C4237A-1
    C3733-25 (male side)   C4237A-8
    C3733-26 (male side)   C4237A-21

Are the resistances less than 3 ohms?
Yes GO to AK9
No INSTALL a new wiring harness.

AK9 INSPECT THE BECM (BATTERY ENERGY CONTROL MODULE) CONNECTOR
  • Inspect BECM C4237A
  • For:
    • corrosion
    • damaged or bent pins
    • pushed-out pins

Are any concerns present?
Yes INSTALL a new wiring harness.
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).

PINPOINT TEST AL: U0100:00

Normal Operation and Fault Conditions

The BECM communicates with the PCM over a HS-CAN to send and receive important vehicle data.

When powered on, the BECM continually monitors the HS-CAN . If communication with a module is lost, a fault is detected and the BECM sets the appropriate DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0100:00 Lost Communication With ECM/PCM 'A': No Sub Type Information This DTC sets if the BECM does not receive an expected message from the PCM .

Possible Sources

  • Wiring, terminals or connectors
  • Network traffic
  • 12-volt battery
  • BECM
  • PCM
AL1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using a diagnostic scan tool, perform BECM self-test.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 5 seconds.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test

Is DTC U0100:00 retrieved?
Yes GO to AL2
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AL2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AL3
No INSTALL a new 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AL3 REVIEW THE DTCS FROM THE BECM (BATTERY ENERGY CONTROL MODULE)
  • Review the Diagnostic Trouble Codes (DTCs) recorded during the BECM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the battery voltage DTC stored in the BECM . REFER to the BECM DTC chart.
No GO to AL4

AL4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, perform a network test.

Does the PCM pass the network test?
Yes GO to AL5
No DIAGNOSE the scan tool communication with the PCM concern.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AL5 RETRIEVE THE DTCS FROM THE PCM (POWERTRAIN CONTROL MODULE)
  • Using a diagnostic scan tool, perform PCM self-test.

Is DTC P0562:00 or P0563:00 recorded?
Yes DIAGNOSE the PCM DTC .
No GO to AL6

AL6 CHECK FOR A LOST COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0100:00 set in multiple modules?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, it is necessary to seek additional help. REFER to the Service Repair And Technical Assistance Process. A vehicle data recorder (VDR) or similar recorder may also be useful.

PINPOINT TEST AM: U0140:00

Normal Operation and Fault Conditions

The BECM communicates with the BCM over a HS-CAN to send and receive important vehicle data.

When powered on, the BECM continually monitors the HS-CAN . If communication with a module is lost, a fault is detected and the BECM sets the appropriate DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0140:00 Lost Communication With Body Control Module: No Sub Type Information This DTC sets if the BECM does not receive an expected message from the BCM .

Possible Sources

  • Wiring, terminals or connectors
  • Network traffic
  • 12-volt battery
  • BECM
  • BCM
AM1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using a diagnostic scan tool, perform BECM self-test.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 5 seconds.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test

Is DTC U0140:00 retrieved?
Yes GO to AM2
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AM2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AM3
No INSTALL a new 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AM3 REVIEW THE DTCS FROM THE BECM (BATTERY ENERGY CONTROL MODULE)
  • Review the Diagnostic Trouble Codes (DTCs) recorded during the BECM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the battery voltage DTC stored in the BECM . REFER to the BECM DTC chart.
No GO to AM4

AM4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, perform a network test.

Does the BCM pass the network test?
Yes GO to AM5
No DIAGNOSE the scan tool communication with the BCM concern.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AM5 RETRIEVE THE DTCS FROM THE BCM (BODY CONTROL MODULE)
  • Using a diagnostic scan tool, perform BCM self-test.

Is DTC U3006:16 or U3006:17 recorded?
Yes DIAGNOSE the BCM DTC .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No GO to AM6

AM6 CHECK FOR A LOST COMMUNICATION WITH THE BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0140:00 set in multiple modules?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM . INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in Section 419-10.
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, it is necessary to seek additional help. REFER to the Service Repair And Technical Assistance Process. A vehicle data recorder (VDR) or similar recorder may also be useful.

PINPOINT TEST AN: U0151:00

Normal Operation and Fault Conditions

The BECM communicates with the RCM over a HS-CAN to send and receive important vehicle data.

When powered on, the BECM continually monitors the HS-CAN . If communication with a module is lost, a fault is detected and the BECM sets the appropriate DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information This DTC sets if the BECM does not receive an expected message from the RCM .

Possible Sources

  • Wiring, terminals or connectors
  • Network traffic
  • 12-volt battery
  • BECM
  • RCM
AN1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using a diagnostic scan tool, perform BECM self-test.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 5 seconds.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test

Is DTC U0151:00 retrieved?
Yes GO to AN2
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AN2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AN3
No INSTALL a new 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AN3 REVIEW THE DTCS FROM THE BECM (BATTERY ENERGY CONTROL MODULE)
  • Review the Diagnostic Trouble Codes (DTCs) recorded during the BECM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the battery voltage DTC stored in the BECM . REFER to the BECM DTC chart.
No GO to AN4

AN4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, perform a network test.

Does the RCM pass the network test?
Yes GO to AN5
No DIAGNOSE the scan tool communication with the RCM concern.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AN5 RETRIEVE THE DTCS FROM THE RCM (RESTRAINTS CONTROL MODULE)
  • Using a diagnostic scan tool, perform RCM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the RCM DTC .
REFER to: Airbag Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing).
No GO to AN6

AN6 CHECK FOR A LOST COMMUNICATION WITH THE RCM (RESTRAINTS CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0151:00 set in multiple modules?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, it is necessary to seek additional help. REFER to the Service Repair And Technical Assistance Process. A vehicle data recorder (VDR) or similar recorder may also be useful.

PINPOINT TEST AO: U0293:00

Normal Operation and Fault Conditions

The BECM communicates with the SOBDMC also known as the Inverter System Controller (ISC) over a HS-CAN to send and receive important vehicle data.

When powered on, the BECM continually monitors the HS-CAN . If communication with a module is lost, a fault is detected and the BECM sets the appropriate DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets if the BECM does not receive an expected message from the SOBDMC .

Possible Sources

  • Wiring, terminals or connectors
  • Network traffic
  • 12-volt battery
  • BECM
  • SOBDMC
AO1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using a diagnostic scan tool, perform BECM self-test.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 5 seconds.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test

Is DTC U0293:00 retrieved?
Yes GO to AO2
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AO2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AO3
No INSTALL a new 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AO3 REVIEW THE DTCS FROM THE BECM (BATTERY ENERGY CONTROL MODULE)
  • Review the Diagnostic Trouble Codes (DTCs) recorded during the BECM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the battery voltage DTC stored in the BECM . REFER to the BECM DTC chart.
No GO to AO4

AO4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, perform a network test.

Does the Secondary On-Board Diagnostic Control Module C (SOBDMC) module pass the network test?
Yes GO to AO5
No DIAGNOSE the scan tool communication with the Secondary On-Board Diagnostic Control Module C (SOBDMC) concern.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AO5 RETRIEVE THE DTCS FROM THE SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C (SOBDMC)
  • Using a diagnostic scan tool, perform Secondary On-Board Diagnostic Control Module C (SOBDMC) self-test.

Is DTC P0562:00 or P0563:00 recorded?
Yes DIAGNOSE the Secondary On-Board Diagnostic Control Module C (SOBDMC) DTC .
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
No GO to AO6

AO6 CHECK FOR A LOST COMMUNICATION WITH THE SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C (SOBDMC) DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0293:00 set in multiple modules?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new INSTALL a new Inverter System Controller (ISC).
REFER to: Inverter System Controller [SOBDMC] (303-14D Electric Powertrain Control, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, it is necessary to seek additional help. REFER to the Service Repair And Technical Assistance Process. A vehicle data recorder (VDR) or similar recorder may also be useful.

PINPOINT TEST AP: U0298:00

Normal Operation and Fault Conditions

The BECM communicates with the Direct Current/Direct Current (DC/DC) converter control module over a HS-CAN to send and receive important vehicle data.

When powered on, the BECM continually monitors the HS-CAN . If communication with a module is lost, a fault is detected and the BECM sets the appropriate DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0298:00 Lost Communication With DC/DC Converter Control Module 'A': No Sub Type Information This DTC sets if the BECM does not receive an expected message from the Direct Current/Direct Current (DC/DC) converter control module.

Possible Sources

  • Wiring, terminals or connectors
  • Network traffic
  • 12-volt battery
  • BECM
  • Direct Current/Direct Current (DC/DC) converter control module
AP1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using a diagnostic scan tool, perform BECM self-test.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 5 seconds.
  • Ignition ON.
  • Using a diagnostic scan tool, perform BECM self-test

Is DTC U0298:00 retrieved?
Yes GO to AP2
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AP2 CHECK THE 12-VOLT BATTERY
  • Carry out the 12-volt battery condition test.
    REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the 12-volt battery pass the condition test?
Yes GO to AP3
No INSTALL a new 12-volt battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

AP3 REVIEW THE DTCS FROM THE BECM (BATTERY ENERGY CONTROL MODULE)
  • Review the Diagnostic Trouble Codes (DTCs) recorded during the BECM self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the battery voltage DTC stored in the BECM . REFER to the BECM DTC chart.
No GO to AP4

AP4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, perform a network test.

Does the Direct Current/Direct Current (DC/DC) converter control module pass the network test?
Yes GO to AP5
No DIAGNOSE the scan tool communication with the Direct Current/Direct Current (DC/DC) converter control module concern.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AP5 RETRIEVE THE DTCS FROM THE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTROL MODULE
  • Using a diagnostic scan tool, perform Direct Current/Direct Current (DC/DC) converter control module self-test.

Is DTC U3003:16 or U3003:17 recorded?
Yes DIAGNOSE the Direct Current/Direct Current (DC/DC) converter control module DTC .
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to AP6

AP6 CHECK FOR A LOST COMMUNICATION WITH THE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTROL MODULE DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0298:00 set in multiple modules?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new Direct Current/Direct Current (DC/DC) converter control module.
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).
No CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, it is necessary to seek additional help. REFER to the Service Repair And Technical Assistance Process. A vehicle data recorder (VDR) or similar recorder may also be useful.

PINPOINT TEST AQ: U0300:00

Normal Operation and Fault Conditions

When powered on, the BECM compares the software part number to the hardware. If a mismatch exists DTC will set. If a fault is detected the BECM will set a DTC . If the BECM senses a fault the (red triangle) warning indicator, MIL are both illuminated and the vehicle will not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0300:00 Internal Control Module Software Incompatibility: No Sub Type Information This DTC sets if BECM software does not match the hardware.

Possible Sources

  • BECM
AQ1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0300:00 present?
Yes GO to AQ2
No The concern is not present at this time.

AQ2 CARRY OUT A PMI (PROGRAMMABLE MODULE INSTALLATION) ON THE BECM (BATTERY ENERGY CONTROL MODULE) .
  • Ignition ON.
  • Using the FDRS with the latest software update perform a PMI on the BECM .
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0300:00 retrieved?
Yes INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No The concern was corrected by performing a PMI .

PINPOINT TEST AR: U0431:00

Normal Operation and Fault Conditions

When powered on, the BECM receives and monitors input messages via the HS-CAN . This DTC sets if the HS-CAN message ignition status from the BCM is invalid. This DTC will not result in the MIL illuminating and will not affect vehicle operation.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0431:00 Invalid Data Received From Body Control Module 'A': No Sub Type Information DTC indicates a HS-CAN message from the BCM is invalid.

Possible Sources

  • Network traffic
  • BCM input
AR1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0431:00 present?
Yes RETRIEVE BCM Diagnostic Trouble Codes (DTCs).
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No The concern is not present at this time.

PINPOINT TEST AS: U0452:00

Normal Operation and Fault Conditions

When powered on, the BECM receives and monitors input messages via the HS-CAN . This DTC sets if the HS-CAN message restraint impact event status from the RCM is invalid. This DTC will not result in the MIL illuminating and will not affect vehicle operation.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0452:00 Invalid Data Received From Restraints Control Module: No Sub Type Information DTC indicates a HS-CAN message restraint impact event status from the RCM is invalid.

Possible Sources

  • Network traffic
  • RCM input
AS1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0452:00 present?
Yes RETRIEVE RCM Diagnostic Trouble Codes (DTCs).
REFER to: Airbag Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing).
No The concern is not present at this time.

PINPOINT TEST AT: U0594:00

Normal Operation and Fault Conditions

When powered on, the BECM receives and monitors input messages via the HS-CAN . This DTC sets if one or more of the following HS-CAN messages high voltage battery contactor request, estimated high voltage battery current, and/or hybrid transaxle inverter voltage from the SOBDMC also known as the Inverter System Controller (ISC) is invalid. If a fault is detected in two consecutive trips the MIL will illuminate.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0594:00 Invalid Data Received From Hybrid/EV Powertrain Control Module 'A': No Sub Type Information DTC indicates a HS-CAN high voltage battery contactor request, hybrid transaxle inverter voltage or estimated high voltage battery current message from the SOBDMC is invalid.

Possible Sources

  • Network traffic
  • SOBDMC input
AT1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0594:00 present?
Yes RETRIEVE SOBDMC Diagnostic Trouble Codes (DTCs).
REFER to: Electric Powertrain Control (303-14D Electric Powertrain Control, Diagnosis and Testing).
No The concern is not present at this time.

PINPOINT TEST AU: U0599:00

Normal Operation and Fault Conditions

When powered on, the BECM receives and monitors input messages via the HS-CAN . This DTC sets if the HS-CAN high-voltage input or high-voltage current usage message from the Direct Current/Direct Current (DC/DC) converter control module is invalid. This DTC will not result in the MIL illuminating and will not affect vehicle operation

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U0599:00 Invalid Data Received From DC/DC Converter Control Module 'A': No Sub Type Information DTC indicates a HS-CAN high-voltage input or high-voltage current usage message from the Direct Current/Direct Current (DC/DC) converter control module is invalid.

Possible Sources

  • Network traffic
  • Direct Current/Direct Current (DC/DC) converter control module inputs
AU1 RETRIEVE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using a diagnostic scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U0599:00 present?
Yes RETRIEVE Direct Current/Direct Current (DC/DC) converter control module Diagnostic Trouble Codes (DTCs).
REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No The concern is not present at this time.

PINPOINT TEST AV: U1030:00

Normal Operation and Fault Conditions

When powered on, the BECM compares the battery back cell type to the BECM software. The BECM determines the battery pack cell type by monitoring of two circuit loops (part of the battery pack wiring harness) are present or not present. If the BECM senses a fault the powertrain malfunction (wrench) indicator and MIL are both illuminated. The electric motor propulsion will be limited reducing vehicle power.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U1030:00 Software Incompatibility With Hybrid/EV Battery: No Sub Type Information This DTC sets if the BECM software detects the incorrect high voltage battery cells.

Possible Sources

  • Incorrect BECM hardware and/or software
  • Mismatch between the BECM and the high voltage battery cell type
AV1 CARRY OUT A PMI (PROGRAMMABLE MODULE INSTALLATION) ON THE BECM (BATTERY ENERGY CONTROL MODULE) .
  • Ignition ON.
  • Using the FDRS with the latest software update perform a PMI on the BECM .
  • Using a diagnostic scan tool, perform BECM self-test.

Is DTC U1030:00 retrieved?
Yes GO to AV2
No The concern was corrected by performing a PMI .

AV2 CHECK FOR CORRECT BECM (BATTERY ENERGY CONTROL MODULE) PART NUMBER
  • Ignition OFF.
  • Using the FDRS select the log viewer icon and record the BECM module part number.

Is the BECM part number correct for vehicle application?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No Reprogram the BECM to the correct level for the high voltage battery installed in the vehicle.
REFER to: Module Programming (418-01 Module Configuration, General Procedures).

PINPOINT TEST AW: U3000:04, U3000:49

Normal Operation and Fault Conditions

When powered on, the BECM performs an internal self tests and monitors high voltage battery voltages at various points inside the pack. If the BECM microchip fails an internal self test or if the high voltage battery pack voltage is invalid DTC U3000:04 or U3000:49 sets. If a fault is detected the BECM will set a DTC . DTC U3000:04 sets three indicators: MIL , stop safely hazard (red triangle) warning, and powertrain malfunction (wrench). DTC U3000:49 sets two indicators: MIL and stop safely hazard (red triangle) warning. The vehicle will shut down and/or not start.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BECM U3000:04 Control Module: System Internal Failures This DTC sets if the BECM detects an internal microchip has failed.
BECM U3000:49 Control Module: Internal Electronic Failure This DTC sets if the BECM detects the high voltage battery voltage or positive contactor voltage is invalid.

Possible Sources

  • Wiring, terminals or connectors (part of the battery pack harness)
  • BECM
AW1 RETRIEVE ALL THE BECM (BATTERY ENERGY CONTROL MODULE) DTCS
  • Ignition ON.
  • Using the scan tool, clear the BECM Diagnostic Trouble Codes (DTCs).
  • Using the scan tool, perform BECM self-test.

Are any Diagnostic Trouble Codes (DTCs) other than U3000:04 or U3000:49 present?
Yes REFER to the BECM DTC chart in this section and diagnose all other Diagnostic Trouble Codes (DTCs) first.
No GO to AW2

AW2 CHECK BECM (BATTERY ENERGY CONTROL MODULE) CONNECTORS FOR BEING FULLY SEATED
  • Ignition OFF.
  • Depower the high voltage system.
    REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
  • Remove the high voltage battery.
    REFER to: High Voltage Battery - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Remove the high voltage battery cover.
    REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
  • Inspect all BECM connectors, and make sure they are fully seated.

Were all the BECM connectors fully seated?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
No If the connectors were NOT fully seated DISCONNECT all the BECM connectors and re-connect them in sequence.
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).
. Repower the high voltage system. REFER to: High Voltage System De-energizing (414-03A High Voltage Battery, Mounting and Cables, General Procedures).
Operate the system and repeat the self test. If the DTC(s) are present INSTALL a new BECM .
REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) (414-03A High Voltage Battery, Mounting and Cables, Removal and Installation).


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