justanswer 1870021 DTC P0BBD Hybrid Energy Storage

Product Information

The product is a hybrid drive system that contains twenty battery modules, each of which contains two 7.2 V cells, resulting in a total nominal system voltage of 288 V. The system also includes a drive motor generator battery, which is controlled by the battery energy control module (BECM). The BECM monitors the hybrid battery voltage on the twenty battery modules and communicates with the hybrid powertrain control module (HPCM) through serial data to diagnose any fault conditions.

Product Usage

Before using the hybrid drive system, it is essential to perform the Diagnostic System Check – Vehicle (with HP2)Diagnostic System Check – Vehicle (without HP2) to ensure that the system is functioning correctly. If a fault condition is present, the driver information center (DIC) will display the SERVICE HYBRID SYSTEM message, and the BECM will send a message to HPCM to reduce the power use limit to 3000 watts.

Diagnostic Instructions

• Perform the Diagnostic System Check – Vehicle (with HP2)Diagnostic System Check – Vehicle (without HP2) prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• 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 Connector End View Reference Component Connector End Views Description and Operation

• Drive Motor Battery System Description

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
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.
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.
7. If not within the specified range, replace the drive motor battery assembly.
8. If all circuits test normal, replace the drive motor generator battery control module.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.

• Drive Motor Battery Replacement and Shipping Preparation
• Control Module References for drive motor generator battery control module replacement, setup and programming.

“Portions of materials contained herein have been reprinted with permission of General Motors Corporation, Service and Parts Operations” License Agreement

0410810.

Copyright 2007 – 2012 Service Repair Solutions, Inc.

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