C028A

DTC C028A

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 C028A 01
- Park Brake Motor Circuit Short to Battery

DTC C028A 02
- Park Brake Motor Circuit Short to Ground

DTC C028A 04
- Park Brake Motor Circuit Open Circuit

DTC C028A 08
- Park Brake Motor Circuit Performance-Signal Invalid

DTC C028A 28
- Park Brake Motor Circuit Performance-Incorrect Frequency

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 parking brake when commanded by the park brake switch. When the 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 parking brake control module will also diagnose the internal park brake motor circuit to verify it is functioning properly. The park brake motor circuit is used to command motor operation, apply and release tension on the parking brake cable, which will apply and release the parking brake.

The park brake will self diagnose the internal Park Brake Motor Circuit. This circuit is used to drive the motor, which pulls on the park brake cable, ultimately applying and releasing the park brake.

Conditions for Running the DTC

* Ignition OFF, ACCESSORY, or RUN mode.

* Battery voltage is between 9 -16V

Conditions for Setting the DTC

The parking brake control module detects an internal motor 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 parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

* The condition for the DTC is no longer present.

Reference Information

Schematic Reference

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

Connector End View Reference

Component Connector End Views Sunshade - Left (DH6)

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

Verify that DTC C028A is not set.

If DTC is set, perform the Park Brake Reset procedure with a scan tool. If the DTC resets, replace the K83 Parking Brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests

* Electronic Parking Brake Control Module Replacement Service and Repair

* Control Module References Control Module References