2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1255
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掳C (19.4掳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 (See: Diagrams/Connector Views)
Description and Operation
Drive Motor Battery System Description ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/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 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.
