C028A

DTC C028A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 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.

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 motor malfunction.

Action Taken When the DTC Sets

* The electric parking brake is disabled.
* A DIC 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 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 (Connector Views)
Description and Operation

Electronic Parking Brake Control Module Description (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Test

Remove the EPB fuse and reinstall. Verify DTC C028A is not set.

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

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for electric parking brake control module replacement, setup, and programming.