P0BBD
DTC P0BBD
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0BBD
- Hybrid Battery Pack Voltage Variation High
Circuit/System Description
The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactor.
The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.
Conditions for Running the DTC
* DTC P0A1F is not set.
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
* Minimum hybrid battery temperature is greater than -7°C (19.4°F).
* Hybrid battery discharge current is greater than 0.2 A.
Conditions for Setting the DTC
The drive motor generator battery control module detects greater than a 1.5 V difference between any two hybrid battery voltage measurements for 3 seconds. However, if any DTCs P0B3C-P0B9D are set, the corresponding battery voltage measurement is ignored by this DTC.
Action Taken When the DTC Sets
* DTC P0BBD is a type B DTC.
* The drive motor generator battery control module sends a message to the hybrid powertrain control module to reduce the power use limit to 3000 watts.
* The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
Conditions for Clearing the DTC
* DTC P0BBD is a type B DTC.
* The DTC will pass when the voltage of all hybrid batteries are within 1 V of each other.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Drive Motor Battery System Description Drive Motor Battery System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References 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 10-19 V, and all readings should be within 1.5 V of each other.
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. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
• If not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
• 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 Battery Replacement and Shipping Preparation Procedures
* Control Module References Control Module References for drive motor generator battery control module replacement, setup and programming.