Service Information

Volt

DTC P1E39

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 P1E39: Auxiliary Transmission Fluid Pump Inverter Performance

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. Each motor control module controls its respective motor through the sequencing actuation of high-current switching transistors called insulated gate bipolar transistors. Each insulated gate bipolar transistor assembly is monitored for fault conditions. The motor control modules are part of the power inverter module and are not serviced separately.

Conditions for Running the DTC

The Vehicle is ON or Charge Mode is active.

Conditions for Setting the DTC

The motor control module detects excessive current flow through the switched portion of the insulated gate bipolar transistor.

Action Taken When the DTC Sets

•	DTC P1E39 is a Type A DTC.

•	Propulsion will be disabled and the power inverter module requests the hybrid powertrain control module 2 to open the high-voltage contactor relays.

Conditions for Clearing the DTC

DTC P1E39 is a Type A DTC.

Reference Information

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

•	Component Connector End Views

•	Inline Harness Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

Danger: Always perform the High-Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High-Voltage Disabling procedure will perform the following tasks:

•	Identify how to disable high voltage.

•	Identify how to test for the presence of high voltage.

•	Identify conditions under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.

Perform the High Voltage Disabling procedure for servicing the T6 power inverter module assembly or the T12 transmission.
Remove the X8 connector from the T6 power inverter module.
Test for infinite resistance between each of the AC circuit terminals listed below and earth:

•	Terminal 1-phase W

•	Terminal 2 phase V

•	Terminal 3-phase U

⇒	If not the specified value, replace the G5 auxiliary transmission fluid pump motor.

⇒	If the circuit tests normal, replace the T6 power inverter module. If the DTC resets, replace the G5 auxiliary transmission fluid pump motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Auxiliary Fluid Pump Motor and Fluid Pump Disassemble in Off-Vehicle Repair Instructions for Auxiliary Transmission Fluid Pump Motor removal.

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