P1A06

DTC P0A1F, P1A05, or P1A06

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 P0A1F
- Battery Energy Control Module Internal Performance

DTC P1A05
- Battery Energy Control Module Random Access Memory (RAM)

DTC P1A06
- Battery Energy Control Module Read Only Memory (ROM)

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

Circuit/System Description

The battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code (DTC) information.

This diagnostic applies to internal microprocessor integrity conditions within the battery energy control module. This fault is internal to the battery energy control module and no external circuits are involved.

Conditions for Running the DTC

* The battery energy control module is awake and communicating.

* The system voltage is at least 9 V.

Conditions for Setting the DTC

The battery energy control module has detected an internal malfunction.

Action Taken When the DTC Sets

* DTCs P0A1F, P1A05, and P1A06 are type A DTCs.

* Vehicle goes to reduced battery power mode. After vehicle is turned off, vehicle will not return to propulsion active mode.

Conditions for Clearing the DTC

DTCs P0A1F, P1A05, and P1A06 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 P0A1F, P1A05, or P1A06 is not set.

• If any of the DTCs are set
Replace the K16 battery energy control module.

• 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