Service Information

Volt

DTC P0A35

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 P0A35: Drive Motor 2 High Temperature

The transmission contains two electric drive motors and an auxiliary transmission fluid pump. The drive motor motors and auxiliary transmission fluid pump are cooled by the transmission fluid. Hot fluid exits the drive motor motors and auxiliary transmission fluid pump 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. A non-serviceable motor temperature sensor is located in each drive motor assembly.

•	DTC P0A35 is a Type B DTC.

•	The hybrid powertrain control module requests the hybrid powertrain control module 2 to open the high-voltage contactor relays.

Conditions for Clearing the DTC

DTC P0A35 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 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 P0A31 is not set.

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

Vehicle ON, observe the scan tool ECM engine coolant temperature (ECT) parameter in freeze frame data. The reading 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, go to Automatic Transmission Overheating . If transmission tests normal, replace M15B drive motor 2 generator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Drive Motor Generator Rotor and Stator Removal - Unit B for Drive Motor 2 replacement