2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1139
Circuit/System Description
The drive motor generator battery has four hybrid battery temperature sensors. The hybrid battery temperature sensors are located on the top of the
hybrid batteries. The temperature sensor is a variable resistor that measures the temperature of the hybrid batteries. The control module supplies 5 V
to the signal circuit and a ground for the low reference circuit. The hybrid battery temperature sensor resistance changes with battery temperature.
The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The drive
motor generator battery control module (BECM) uses the battery temperature sensors to determine the hybrid battery temperature to control the
battery cooling fan operation.
Conditions for Running the DTC
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
Conditions for Setting the DTC
P0A9C, P0AC6, P0ACB, and P0AE9
The hybrid battery temperature sensor is in normal operating range, but is 15掳C (59掳F) different from the other 3 sensors.
P0A9D, P0AC7, P0ACC, and P0AEA
The hybrid battery temperature is greater than 95掳C (203掳F) and one other temperature sensor is less than 70掳C (158掳F).
P0A9E, P0AC8, P0ACD, and P0AEB
The hybrid battery temperature is less than -40掳C (-40掳F).
Action Taken When the DTC Sets
* DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are type B DTCs.
* If two sensors fail, the drive motor generator battery sends a message to the hybrid powertrain control module to reduce the power use limit
to 50 percent and the battery vent fan will default to run.
* If all four sensors fail, the state of charge (SOC) will be considered invalid.
Conditions for Clearing the DTC
DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are type B DTCs.
Reference Information
Schematic Reference
Hybrid Cooling Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Drive Motor Generator Battery Cooling 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)
