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DTC C056D

DTC C056D

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 C056D 34

ECU Hardware Performance RAM Failure

DTC C056D 35

ECU Hardware Performance ROM Failure

DTC C056D 36

ECU Hardware Performance EEPROM Failure

DTC C056D 37

ECU Hardware Performance watchdog/safety uC Failure

DTC C056D 39

ECU Hardware Performance Internal Electronic Failure

DTC C056D 3C

ECU Hardware Performance Internal Communications Failure

Circuit/System Description

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

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The electric parking brake control module detects an internal hardware malfunction.

Action Taken When the DTC Sets


• The electric parking brake is disabled.

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


Conditions for Clearing the DTC


• The electric parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

• The condition for setting the DTC is no longer present.

• The latest software and calibrations are programmed into the electric parking brake control module.


Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Parking Brake Control Module Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify DTC C056D 36 is not set.

2. If DTC is set, perform the Electronic Parking Brake Control Module Programming and Setup .

3. With a scan tool , perform the Parking Brake Actuator DTC Reset procedure. Verify DTC C056D is not set.

4. If DTC is set, replace the K83 Electric Parking Brake Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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