Service Information

Volt

DTC P1E20-P1E22

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 P1E20: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage

DTC P1E21: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

DTC P1E22: Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage System Isolation Lost

Circuit/System Description

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 drive motor control module monitors its internal high voltage sensor for correct operation, no external circuits are involved. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.

Conditions for Running the DTC

•	The vehicle is ON.

•	The system voltage is 8-18 V.

•	The high voltage contactor relays are closed.

Conditions for Setting the DTC

DTC P1E20

The drive motor control module detects high-voltage sensor voltage less than 30 V.

DTC P1E21

The drive motor control module detects high-voltage sensor voltage greater than 500 V.

P1E22

The drive motor control module detects an isolation fault between the battery pack and chassis earth.

Action Taken When the DTC Sets

•	DTCs P1E20 and P1E21 are Type A DTCs.

•	DTC P1E22 is a Type B DTC.

Conditions for Clearing the DTC

•	DTCs P1E20 and P1E21 are Type A DTCs.

•	DTC P1E22 is a Type B DTC.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

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.