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DTC C028F

DTC C028F

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 C028F 01

Handbrake solenoid valve regulator circuit. Short to Battery

DTC C028F 02

Handbrake solenoid valve regulator circuit. Short to Ground

DTC C028F 08

Handbrake solenoid valve regulator circuit. Performance signal invalid.

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 control 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 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 parking brake control module detects an internal park brake solenoid malfunction.

Action Taken When the DTC Sets


• The electric parking brake is disabled, one release allowed.

• 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 setting the DTC is no longer present.


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

Verify that DTC C028F is not set.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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