Service Information

Volt

DTC P1BFF or P1E23-P1E25

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 P1BFF: Auxiliary Transmission Fluid Pump Motor Control Module Not Programmed

DTC P1E23: Auxiliary Transmission Fluid Pump Control Module Random Access Memory

DTC P1E24: Auxiliary Transmission Fluid Pump Control Module Long Term Memory Performance

DTC P1E25: Auxiliary Transmission Fluid Pump Control Module Read Only Memory

Circuit/System Description

This is an internal fault detection of the auxiliary transmission fluid pump control module. The modules listed below are internal to the power inverter module and are not serviced separately. These faults are handled inside the hybrid powertrain control module and no external circuits are involved.

•	Auxiliary transmission fluid pump control module

•	Drive motor control module 1

•	Drive motor control module 2

•	Hybrid powertrain control module

Conditions for Running the DTC

•	The vehicle is ON.

•	The system voltage is 8-18 V.

Conditions for Setting the DTC

The control module has detected an internal malfunction or a control module was not programmed after replacement.

Action Taken When the DTC Sets

•	DTCs P1BFF P1E23, P1E24, and P1E25 are Type A DTCs.

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

Conditions for Clearing the DTC

DTCs P1BFF P1E23, P1E24, and P1E25 are Type A DTCs.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

Verify that DTC P0562 is not set.

⇒	If DTC is set, refer to DTC B1325, B1330, B1517, C0800, C0899, C0900, C12E1, C12E2, P0562, P0563, P1A0C, P1A0D, or P1EFC .

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