2010 Cadillac Truck Escalade RWD V8-6.2L Page 1557
42-volt circuit temperature is less than 90掳C (194掳F).
P1A8B 11
42-volt circuit temperature is less than 100掳C (212掳F).
P1A8C
* DTC P1A8C is a Type C DTC.
* 42-volt circuit temperature is less than 110掳C (230掳F).
Diagnostic Aids
* DTC C0561 76 may be set.
* This DTC could be caused by a possible power electronics cooling system failure due to the following:
- Restricted radiator air flow or coolant fans inoperative
- Restricted power electronics coolant flow or contaminated coolant
- Inoperative power electronics cooling system water pump
Reference Information
Schematic Reference
Hybrid Controls Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Drive Motor Generator Control Module Description and Operation ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* 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)
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
Circuit/System Verification
Inspect for DTC P0AF7.
If the DTC is set, refer to DTC P0AF7 (See: P Code Charts/P0AF7).
If the DTC is not set, continue to Circuit/System Testing.
Circuit/System Testing
1. Place the vehicle in Park and start the engine.
2. Place the steering wheel in the centered position. Do not rotate the steering wheel.
3. Observe the 42V Circuit Current parameter in the APM data list on the scan tool.
瀚慖f the 42V Circuit Current parameter is greater than 0.5 amps with no steering input, replace the power steering control module (PSCM).
4. Rapidly rotate the steering wheel to the left and right while observing the 42V Circuit Current parameter.
瀚慖f the 42V Circuit Current parameter is greater than 40 amps, replace the PSCM.
瀚慖f the 42V Circuit Current parameter is less than 40 amps, replace the APM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for APM or PSCM replacement, setup, and programming
