FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 2012 >> Volt L4-1.4L Elect >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1EF7

P1EF7




DTC P15B9, P15BA, P1A5E, P1A5F, P1EF6, P1EF7, P2534, or P2535

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 P15B9
- Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage

DTC P15BA
- Electric A/C Compressor Control Module Ignition On/Start Switch Circuit High Voltage

DTC P1A5E
- Battery Energy Control Module Ignition On/Start Switch Circuit Low Voltage

DTC P1A5F
- Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage

DTC P1EF6
- Battery Charger Control Module Ignition On/Start Switch Circuit Low Voltage

DTC P1EF7
- Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage

DTC P2534
- Ignition On/Start Switch Circuit Low Voltage

DTC P2535
- Ignition On/Start Switch Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the transmission control module (TCM).

Conditions for Running the DTC

P15B9
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle ON or Vehicle in Service Mode.
* System voltage greater than 10.25 V.

P15BA
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle OFF.
* System voltage greater than 10.25 V.

P1A5E
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle ON or Vehicle in Service Mode.
* Battery energy control module is awake.
* System voltage greater than 9 V.

P1A5F
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle OFF.
* Battery energy control module is awake.
* System voltage greater than 9 V.

P1EF6
* Hybrid powertrain control module 2 is awake.
* System voltage between 9-16 V.
* Vehicle power mode is Vehicle ON or Vehicle in Service Mode.
* This DTC can only run when the output is activated.

P1EF7
* Hybrid powertrain control module 2 is awake.
* System voltage between 9-16 V.
* Vehicle power mode is Vehicle OFF.

P2534, P2535
* The hybrid powertrain control module 2 is awake.
* The engine is running.
* The TCM is communicating on the serial data circuits.

Conditions for Setting the DTC

P15B9
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle ON or Vehicle in Service Mode.
* Hybrid powertrain control module 2 ignition input is active.
* A/C compressor ignition input is not active and not greater than 5 V.

P15BA
* Hybrid powertrain control module 2 is awake.
* Vehicle power mode is Vehicle OFF.
* Hybrid powertrain control module 2 ignition input is not active.
* A/C compressor ignition input is active and not below 5 V.

P1A5E
* Hybrid powertrain control module 2 is awake.
* Ignition input is active and not above 5 V.

P1A5F
* Hybrid powertrain control module 2 is awake.
* Ignition input is not active and not below 5 V.

P1EF6
* Hybrid powertrain control module 2 is awake.
* Ignition output is active and a short to ground is detected 3 consecutive times.
* Ignition output is not active and an open circuit is detected 20 consecutive times.

P1EF7
* Hybrid powertrain control module 2 is awake.
* Ignition output is not active and a short to battery is detected 3 consecutive times.

P2534, P2535
* The hybrid powertrain control module 2 is awake.
* The fuel pump control module detects that the ignition voltage is less than 6 V.
* The TCM detects less than 2 V on the ignition voltage circuit at the TCM for greater than 10 seconds.

Action Taken When the DTC Sets

P15B9, P15BA

DTCs P15B9 and P15BA are type A DTCs.

P1A5E, P1A5F

DTCs P1A5E and P1A5F are type B DTCs.

P1EF6
* The ignition output is deactivated when a short to ground is detected. After 100 ms the output is activated again. This happens 3 times and then the output is deactivated until a new Vehicle ON or Vehicle in Service Mode request is received.
* Open: No action is taken.

P1EF7

No action is taken

P2534, P2535
* DTCs P2534 and P2535 are type A DTCs.
* The TCM turns off all solenoids.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.

Conditions for Clearing the DTC

P15B9, P15BA, P2534, P2535

DTCs P15B9, P15BA, P2534 and P2535 are type A DTCs.

P1A5E, P1A5F

DTCs P1A5E and P1A5F are type B DTCs.

P1EF6, P1EF7
* The current DTC will clear when the malfunction is no longer present during a DTC check.
* A history DTC clears when the module power mode cycle counter reaches the reset threshold of 40, without a repeat of the malfunction.

Diagnostic Aids

A short to voltage in the ignition circuit will keep the vehicle modules awake, which can drain the vehicle's battery.

Reference Information
Schematic Reference

Power Distribution Schematics Power Distribution Schematics
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Power Mode Description and Operation Power Mode
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Verify DTC B144B is not set.

• If the DTC is set, refer to DTC B144B B144B.

2. Vehicle in Service Mode, verify that DTC P15B9, P15BA, P1A5E, P1A5F, P1EF6, P1EF7, P2534, or P2535 is not set.

• If two or more DTCs are set, refer to Hybrid Powertrain Control Module 2 Circuit Malfunction.
• If only one DTC is set, refer to Non-Hybrid Powertrain Control Module 2 Control Module Circuit Malfunction.

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 condition 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 meters (50 feet) of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V 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 energized or not.


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


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 (1-877-446-8227) if you have any questions.


Hybrid Powertrain Control Module 2 Circuit Malfunction
1. Disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2.
2. Vehicle OFF, verify that a test lamp does not illuminate between the ignition circuit terminal 27 and ground.

• If the test lamp illuminates appears, test the ignition circuit for a short to voltage. If the circuit tests normal, refer to Power Mode Mismatch Power Mode Mismatch.

3. Vehicle in Service Mode, verify that a test lamp illuminates between the ignition circuit terminal 27 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch Power Mode Mismatch.

4. If all circuits test normal, replace the K114B Hybrid Powertrain Control Module 2.

Non-Hybrid Powertrain Control Module 2 Control Module Circuit Malfunction
1. Perform the High Voltage Disabling procedure before proceeding with this diagnostic. Refer to High Voltage Disabling High Voltage Disabling.
2. Reconnect the 12 V battery.
3. Disconnect the harness connector at the appropriate control module.
4. Vehicle OFF, verify that a test lamp does not illuminate between the ignition circuit at the module and ground.

• If the test lamp illuminates appears, test the ignition circuit for a short to voltage. If the circuit tests normal, refer to Power Mode Mismatch Power Mode Mismatch.

5. Vehicle in Service Mode, verify that a test lamp illuminates between the ignition circuit at the module and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch Power Mode Mismatch.

6. If all circuits test normal, replace the control module.

Repair Instructions

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

Control Module References Programming and Relearning for the appropriate control module replacement, programming and setup

pro multis Credits:Operation CHARM About Operation CHARM