P0BBD
DTC P0BBD
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 Descriptor
DTC P0BBD
- Hybrid Battery Pack Voltage Variation High
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. The BECM monitors and compares these 20 voltage measurements, if the BECM detects a voltage difference greater than a calibrated value on any two consecutive hybrid battery voltage measurements 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.
* Minimum hybrid battery temperature is greater than -7°C (19°F).
* Hybrid battery discharge current is greater than 0.2 A.
Conditions for Setting the DTC
The BECM 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
* The BECM sends a message to the HPCM 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 (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 (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
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, and all readings should be within 1.5 Volts 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. Remove the drive motor generator battery case upper 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 and that they are 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 battery control module assembly.
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.