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DTC C028B

DTC C028B

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 C028B 08

Park Brake Motor Position Sensor Signal Performance-Signal Invalid

DTC C028B 26

Park Brake Motor Position Sensor Signal Low Frequency

DTC C028B 29

Park Brake Motor Position Sensor Signal Too Few Pulses

DTC C028B 2A

Park Brake Motor Position Sensor Signal Too Many Pulses

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 also contains an internal park brake motor position sensor which monitors the internal park brake motor position.

The engine position sensor is an internal sensor for the handbrake control module. The sensor is used to monitor the engine position for the internal handbrake.

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

• Calibrate 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

Verify DTC C028B is not set.

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.