P1E90

DTC P1E8E-P1E91

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P1E8E
- Hybrid/EV Battery Interface Control Module 1 Performance

DTC P1E8F
- Hybrid/EV Battery Interface Control Module 1 Random Access Memory Performance

DTC P1E90
- Hybrid/EV Battery Interface Control Module 1 Read Only Memory Performance

DTC P1E91
- Hybrid/EV Battery Interface Control Module 1 Long Term Memory Performance

For symptom byte information, refer to Symptom Byte List Symptom Byte List.

Circuit/System Description

The Hybrid/EV Battery Interface Control Module 1 will diagnose its own systems and determine when a fault condition is present. This diagnostic applies to internal microprocessor integrity conditions within the Hybrid/EV Battery Interface Control Module 1. This fault is internal to the Hybrid/EV Battery Interface Control Module 1 and no external circuits are involved.

Conditions for Running the DTC

* The device is awake.

* The system voltage is at least 9 V.

* DTC U2603 is not set.

Conditions for Setting the DTC

The device has detected an internal malfunction.

Action Taken When the DTC Sets

DTCs P1E8E, P1E8F, P1E90 and P1E91 are type A DTCs.

Conditions for Clearing the DTC

DTCs P1E8E, P1E8F, P1E90, and P1E91 are type A DTCs.

Diagnostic Aids

If stored only as a history DTC and not retrieved as a current DTC, do not replace the device.

Circuit/System Verification

Danger: The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center if you have any questions.


1. Vehicle in Service Mode.

2. Verify that DTC P1E8E, P1E8F, P1E90 or P1E91 is not set.

• If any of the DTCs are set
Replace the K112A Hybrid/EV Battery Interface Control Module 1.

• If none of the DTCs are set

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Programming and Relearning for device replacement, programming and setup