Service Information

Volt

DTC P1E37

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 P1E37: Auxiliary Transmission Fluid Pump Inverter High Temperature

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. The inverter temperature sensor is part of the power inverter module and is not serviced separately.

Conditions for Running the DTC

•	The vehicle is ON and propulsion is active.

•	DTC P1E36 is not set.

Conditions for Setting the DTC

The pump inverter temperature sensor is greater than 98°C (208°F).

Action Taken When the DTC Sets

•	DTC P1E37 is a Type B DTC.

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

Conditions for Clearing the DTC

DTC P1E37 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.

Reference Information

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 P1E36 is not set.

⇒	If DTC P1E36 is set, refer to DTC P1E34-P1E36 .

Verify that DTC P0C11, P0C12, P0C13, P0C14, P0C15, or P0C16 is not set.

⇒	If DTC P0C11, P0C12, P0C13, P0C14, P0C15, or P0C16 is set, refer to DTC P0C11-P0C16 .

If the DTC is set, program the T6 power inverter module. If the DTC resets, replace the T6 power inverter module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming and set-up.