Park Brake

DTC C056E

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC C056E 41
- Electronic Control Unit Software Not Programmed

DTC C056E 42
- Electronic Control Unit Software Calibration Not Programmed

DTC C056E 47
- Electronic Control Unit Software VIN Not Programmed

DTC C056E 5A
- Electronic Control Unit Software Not Plausible

DTC C056E 71
- Electronic Control Unit Software Invalid Data

Circuit/System Description

The parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The parking brake control module also contains the logic for applying and releasing the park brake when commanded by the park brake switch. When the parking brake control module receives a signal from the park brake switch, the internal circuit board temperature is checked to verify it is within operating range before the parking brake control module performs the requested operation.

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The parking brake module has detected missing calibration data, calibration procedure not run or completed, missing VIN, or internal software malfunction.

Actions Taken When DTC Sets

C056E 41 or C056E 5A

* The parking brake is disabled.

* A message and/or a warning indicator may be displayed.

C056E 42

* The parking brake functionality is degraded or disabled.

* A message and/or a warning indicator may be displayed.

C056E 47 or C056E 71

The parking brake will function normally.

Conditions for Clearing the DTC

* The parking brake control module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.

* The condition for the DTC is no longer present.

* The latest software and calibrations are programmed into the parking brake module.

Reference Information

Schematic Reference

Park Brake System Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Outside Rearview Mirror - Driver

Description and Operation

Electronic Parking Brake Control Module Description Description and Operation

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

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify that DTC C056E is not set.

• If the DTC is set

1. Program the K83 parking brake control module. Refer to Electronic Parking Brake Control Module Programming and Setup Testing and Inspection.

2. Verify the DTC is not set.

• If the DTC is set,
replace the K83 parking brake control module.

• If the DTC is not set

3. All OK.

• If the DTC is not set

3. All OK.

Repair Instructions

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

Control Module References Control Module References for parking brake control module replacement, programming and setup