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Home >> Chevrolet >> 2013 >> Volt L4-1.4L Elect >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1EF6

P1EF6




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.

• If the DTC is not set

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

• If two or more DTCs are set
Refer to Circuit/System Testing - Hybrid Powertrain Control Module 2 Circuit Malfunction.

• If only one DTC is set

3. Refer to Circuit/System Testing - Non-Hybrid Powertrain Control Module 2 Control Module Circuit Malfunction.

Circuit/System Testing

Danger:
High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling / Enabling is mandatory. The High Voltage Qualified Technician is responsible for the adherence to the manufacturer's service instructions as well as current national legal regulations.


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


Questions regarding training can be answered by your national training centre.


Danger:
Any hybrid/EV battery pack replacement shall be performed by High Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior removal of the battery pack.


Hybrid Powertrain Control Module 2 Circuit Malfunction

1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2.

2. Verify that a test lamp does not illuminate between the ignition circuit terminal 27 and ground.

• If the test lamp illuminates
Repair the short to voltage on the ignition circuit.

• If the test lamp does not illuminate

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the ignition circuit terminal 27 and ground.

• If the test lamp does not illuminate and the circuit fuse is OK

1. Vehicle OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.

2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K17 electronic brake control module.

• If the test lamp illuminates

5. Refer to Power Mode Mismatch Power Mode Mismatch.

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. Vehicle OFF, disconnect the X2 harness connector at the K114B hybrid powertrain control module 2.

4. Verify that a test lamp does not illuminate between the ignition circuit terminal 27 and ground.

• If the test lamp illuminates
Repair the short to voltage on the ignition circuit.

• If the test lamp does not illuminate

5. Vehicle in Service Mode

6. Verify a test lamp illuminates between the ignition circuit terminal 27 and ground.

• If the test lamp does not illuminate and the circuit fuse is OK

1. Vehicle OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.

2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K17 electronic brake control module.

• If the test lamp illuminates

7. Refer to Power Mode Mismatch Power Mode Mismatch.

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

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