Service Information

Volt

DTC P1A60

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 Descriptors

DTC P1A60: Battery Energy Control Module Ignition Accessory Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Serial Data Wake-Up	P1A60	P1A60	--	--

The hybrid powertrain control module 2 sends the serial data wake-up power mode status in a serial data message to the battery energy control module. The hybrid powertrain control module 2 also powers up the serial data wake-up circuit to the battery energy control module when the vehicle power mode is Vehicle ON or Vehicle in Service Mode.

Conditions for Running the DTC

•	Vehicle power mode is Vehicle ON or Vehicle in Service Mode

•	Battery energy control module is awake

•	System voltage greater than 9 V

Conditions for Setting the DTC

Ignition input is active, and 500 ms after the ignition input transitions high, a voltage below 5 V is detected 3 consecutive times

Action Taken When the DTC Sets

DTC P1A60 is a type B DTC.

Conditions for Clearing the DTC

DTC P1A60 is a type B DTC.

Diagnostic Aids

A short-circuit to voltage in the serial data wake-up circuit will keep the vehicle bus awake, which can drain the vehicle's battery.

Reference Information

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

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.

Before working on any high-voltage system, be sure to wear the following Personal Protection Equipment:

•	Safety glasses with appropriate side shields when within 15 metres (50 feet) of the vehicle, either indoors or outdoors.

•	Certified and up-to-date Class "0" Insulation gloves rated at 1,000 V with leather protectors.

-	Visually and functionally inspect the gloves before use.

-	Wear the Insulation gloves with leather protectors at all times when working with the high-voltage battery assembly, whether the system is energised or not.

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

Danger: The Volt Battery Pack will utilise 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 Centre (1-877-446-8227) if you have any questions.

Perform the High-Voltage Disabling procedure before proceeding with this diagnostic. Refer to High Voltage Disabling .
Reconnect the 12 V battery.
Disconnect the X2 harness connector at the A4 hybrid battery pack.
Vehicle OFF, verify that a test lamp does not illuminate between the serial data wake-up circuit terminal 3 and earth.

⇒	If the test lamp illuminates, test the serial data wake-up circuit for a short-circuit to earth. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

Vehicle in Service Mode, verify that a test lamp illuminates between the serial data wake-up circuit terminal 3 and earth.

⇒	If the test lamp does not illuminate, test the serial data wake-up circuit for a short-circuit to earth or an open-circuit/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

If all circuits test normal, replace the K16 battery energy control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic repair.

Control Module References for the appropriate control module replacement, programming and set-up