2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1201

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1201

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/8. Drive Motor with Generator Assembly Removal -

1st Position)

* Drive Motor with Generator Assembly Removal - 2nd Position (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/13. Drive Motor with Generator Assembly Removal

- 2nd Position)

P0A2F

DTC P0A2F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0A2F

- Drive Motor 1 Overtemperature

Circuit/System Description

The transmission contains two electric motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive

motor generator housing and flows to the transmission cooler supply line. The supply line connects to the cooler. From the cooler, the fluid returns

through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. A

non-serviceable motor temperature sensor (MTS) is located in each drive motor generator assembly.

Conditions for Running the DTC

DTC P0A2B is not set.

Conditions for Setting the DTC

The MTS is greater than 200掳C (392掳F) for 3 seconds and has not fallen below 135掳C (275掳F).

Action Taken When the DTC Sets

* DTC P0A2F is a Type B DTC.

* The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor

relays.

Conditions for Clearing the DTC

DTC P0A2F is a Type B DTC.

Diagnostic Aids

* The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the transmission fluid temperature

(TFT) is more than 132掳C (270掳F) for 10 minutes.

* Ask about the customer's driving habits, trailer towing, etc.

* Ensure the engine cooling system is functioning normally.

* The HPCM will reduce drive motor generator torque at temperatures greater than 160掳C (320掳F). Drive motor generator torque is reduced to

zero if the temperature reaches 190掳C (374掳F).

Reference Information

Schematic Reference

Hybrid Controls Schematics ()

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)