C028F

DTC C028F

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 C028F 01
- Park Brake Solenoid Actuator Circuit Short to Battery

DTC C028F 02
- Park Brake Solenoid Actuator Circuit Short to Ground

DTC C028F 08
- Park Brake Solenoid Actuator Circuit Performance-Signal Invalid

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 contains an internal park brake solenoid actuator, and performs diagnostics on the solenoid actuator circuitry 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 module detects an internal parking brake solenoid malfunction.

Action Taken When the DTC Sets

* The electric parking brake is disabled, one release allowed.
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The electric parking brake 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 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

With a scan tool , perform the Parking Brake Actuator DTC Reset procedure. Verify DTC C028F is not set.

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

Repair Instructions

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

Control Module References Control Module References for Electric Parking Brake Module replacement, setup, and programming