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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 provide an overview of each diagnostic category.

DTC Descriptors

DTC C028B 08: Hand brake Motor Position Sensor Signal Performance-Signal Invalid

DTC C028B 26: Hand brake Motor Position Sensor Signal Low Frequency

DTC C028B 29: Hand brake Motor Position Sensor Signal Too Few Pulses

DTC C028B 2A: Hand brake Motor Position Sensor Signal Too Many Pulses

Circuit/System Description

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

The Hand brake Motor Position Sensor is an internal sensor to the hand brake control module, this sensor is used to monitor the hand brake motor position.

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The hand brake control module detects an internal motor position sensor signal malfunction.

Action Taken When the DTC Sets
    • The electric hand brake is disabled, one release allowed.
    • A message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC
    • The hand brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.
    • Calibrate the hand brake control module.

Reference Information

Schematic Reference

Hand brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Hand 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.

⇒If DTC is set, perform the Hand brake Calibration procedure in Configuration/Reset Functions. If the DTC resets replace the K83 Hand brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification

    •  Electronic Hand brake Control Module Replacement
    •  Control Module References
   


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