2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1182
Conditions for Running the DTC
Ignition/Accessory On.
Conditions for Setting the DTC
APM heat plate temperature is greater than 105掳C (221掳F).
Action Taken When the DTC Sets
* DTC P0AF7 is a Type C DTC.
* The ECM will disable engine operation or command the TAC system to operate in a reduced engine power mode.
* The ECM commands the reduced engine power indicator ON.
Conditions for Clearing the DTC
* DTC P0AF7 is a Type C DTC.
* APM heat plate temperature is less than 95掳C (203掳F).
Diagnostic Aids
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
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
1. Review the Failure Records when the DTC set.
瀚慖f the engine coolant temperature (ECT) was above 125掳C (257掳F) when the DTC set, go to Symptoms - Engine Cooling (See: Engine,
Cooling and Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Cooling) and
correct that concern first.
2. Operate the vehicle while monitoring the APM heat plate temperature with the scan tool.
3. If the APM heat plate temperature is more than 100掳C (212掳F) proceed with Circuit/System Testing.
Circuit/System Testing
1. Inspect for proper coolant level in the hybrid cooling system reservoir.
瀚慖f coolant level is low refer to Generator Control Module Cooling System Draining and Filling ().
2. Inspect the hybrid cooling system radiator for debris or obstruction, or restricted or mis-routed coolant hoses.
瀚慖f a concern is found, repair or replace the restricted or damaged components as necessary.
3. Inspect for proper operation of all hybrid system coolant pumps.
瀚慖f a concern is found, repair or replace the coolant pumps as necessary.
4. Command the cooling fans through all operating speeds.
瀚慖f the cooling fans do not operate in all speeds, refer to Cooling Fan Inoperative (without HP2) (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Cooling Fan Inoperative)Cooling Fan
Inoperative (with HP2) (See: Engine, Cooling and Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic
Procedures/Cooling Fan Inoperative).
5. If the above inspections do not identify a concern, disassemble the drive motor generator control module assembly and inspect the APM and
