Service Information

Volt

DTC P0A2F

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0A2F: Drive Motor 1 High Temperature

The transmission contains two electric motor generators. The drive motors are cooled by the transmission fluid. Hot fluid exits the drive motor 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. The motor temperature sensor is part of the drive motor generator assembly and is not serviced separately.

Conditions for Running the DTC

DTC P0A2B is not set.

Conditions for Setting the DTC

The motor temperature sensor is greater than 200°C (392°F) for 3 seconds and has not fallen below 135°C (275°F).

Action Taken When the DTC Sets

•	DTC P0A2F is a Type B DTC.

•	The hybrid powertrain control module commands the engine into derate mode.

•	Autostop is disabled.

Conditions for Clearing the DTC

DTC P0A2F is a Type B DTC.

Diagnostic Aids

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

•	Ensure the engine cooling system is functioning normally.

•	The hybrid powertrain control module will reduce drive motor generator torque at temperatures greater than 160°C (320°F). Drive motor generator torque is reduced to zero if the temperature reaches 190°C (374°F).

Reference Information

Description and Operation

Electronic Component Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that DTC P0A2C is not set.

⇒	If DTC P0A2C is set, refer to DTC P0A2B-P0A2D or P0A31-P0A33 .

Vehicle ON, observe the scan tool ECM engine coolant temperature (ECT) and Transmission Fluid Temperature parameters in freeze frame data. The readings should be below 125°C (257°F).

⇒	If the ECT was above 125°C (257°F) when the DTC set, go to Engine Overheating and correct that concern first.

Vehicle ON, observe the scan tool motor 1 temperature and motor 2 temperature parameters in freeze frame data. The reading should be above 200°C (392°F). If greater than the specified value, refer to Automatic Transmission Overheating . If the transmission tests normal, replace M15A drive motor 1 generator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Drive Motor Generator Rotor and Stator Removal - Unit A for Drive Motor 1 replacement