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P0B6B




DTC P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, or P0B9D

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0B3E
- Hybrid Battery 1 Circuit High Voltage

DTC P0B43
- Hybrid Battery 2 Circuit High Voltage

DTC P0B48
- Hybrid Battery 3 Circuit High Voltage

DTC P0B4D
- Hybrid Battery 4 Circuit High Voltage

DTC P0B52
- Hybrid Battery 5 Circuit High Voltage

DTC P0B57
- Hybrid Battery 6 Circuit High Voltage

DTC P0B5C
- Hybrid Battery 7 Circuit High Voltage

DTC P0B61
- Hybrid Battery 8 Circuit High Voltage

DTC P0B66
- Hybrid Battery 9 Circuit High Voltage

DTC P0B6B
- Hybrid Battery 10 Circuit High Voltage

DTC P0B70
- Hybrid Battery 11 Circuit High Voltage

DTC P0B75
- Hybrid Battery 12 Circuit High Voltage

DTC P0B7A
- Hybrid Battery 13 Circuit High Voltage

DTC P0B7F
- Hybrid Battery 14 Circuit High Voltage

DTC P0B84
- Hybrid Battery 15 Circuit High Voltage

DTC P0B89
- Hybrid Battery 16 Circuit High Voltage

DTC P0B8E
- Hybrid Battery 17 Circuit High Voltage

DTC P0B93
- Hybrid Battery 18 Circuit High Voltage

DTC P0B98
- Hybrid Battery 19 Circuit High Voltage

DTC P0B9D
- Hybrid Battery 20 Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The BECM will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the BECM to the hybrid powertrain control module (HPCM) through serial data. The HPCM is the host controller for diagnostic trouble code (DTC) information.

The hybrid battery assembly consists of 40 individual batteries. Each battery is rated at 7.2 V. A pair of batteries is rated at 14.4 V. The batteries are connected together in a series circuit. The BECM monitors the hybrid battery voltage on every two batteries for a total of 20 locations, across the battery assembly. If a hybrid battery voltage level increases above a calibrated value, this DTC will set.

Conditions for Running the DTC

* DTC P0A1F is not set.
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.

Conditions for Setting the DTC

Any hybrid battery voltage value is greater than 23 V for 1.5 seconds.

Action Taken When the DTC Sets

* The BECM commands the battery vent fan to high speed.
* If more than 4 of these DTCs are set the drive motor generator battery sends a message to the HPCM to reduce the power use limit to 50 percent.

Conditions for Clearing the DTC

DTCs P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, and P0B9D are type B DTCs.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

* EL-48571 High Voltage Battery Pin Out Box
* EL-48900 HEV Safety Kit

Circuit/System Verification

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 13-19 Volts.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Failure to follow the procedures exactly as written may result in serious injury or death.


1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
2. Remove the drive motor generator battery cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement (Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement).
3. Disconnect the X4 harness connector at the BECM.
4. Connect the EL-48571 high voltage battery pin out box to the X4 harness connector.
5. Install the high voltage manual disconnect lever.
6. Test for 13-19 V across all 20 battery voltage reference circuits.

• If not within the specified range, replace the drive motor battery assembly.

7. If all circuits test normal, replace the drive motor generator battery control module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Replacement)
* Control Module References (Programming and Relearning) - for drive motor generator battery control module replacement, setup and programming.

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