GM Service Manual Online
For 1990-2009 cars only

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC C028D 00: Replace Park Brake Pad Malfunction

Circuit/System Description

The electronic park brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The electronic park brake control module also contains the logic for applying and releasing the park brake when commanded by the electronic park brake switch. When the electronic park 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 ON.

Conditions for Setting the DTC

The electronic park brake control module detects a park brake pad malfunction.

Action Taken When the DTC Sets

A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

    • The electronic park brake control module clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
    • Replace the park brake pads.

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 C028D is not set.

If DTC is set, replace the brake pad.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for electronic park brake control module replacement, setup, and programming.