PRE-RELEASE
DTC C028A
| DTC C028A |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC C028A 01
Park Brake Motor Circuit. Circuit Short to Battery
DTC C028A 02
Park Brake Motor Circuit Short to Ground
DTC C028A 04
Park Brake Motor Circuit Open Circuit
DTC C028A 08
Park Brake Motor Circuit. Performance Signal Invalid
DTC C028A 28
Park Brake Motor Circuit Performance-Incorrect Frequency
| 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 will also diagnose the internal park brake motor circuit to verify it is functioning properly. The park brake motor circuit is used to command motor operation, apply and release tension on the parking brake cable, which will apply and release the parking brake.
The electric park brake will self diagnose the internal Park Brake Motor Circuit. This circuit is used to drive the motor, which pulls on the electric park brake cable, ultimately applying and releasing the park brake.
| Conditions for Running the DTC |
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Ignition OFF, ACCESSORY, or RUN mode.
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Battery voltage is between 9 -16V
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| Conditions for Setting the DTC |
The electric parking brake module detects an internal motor malfunction.
| Action Taken When the DTC Sets |
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The electric parking brake is disabled.
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A DIC message and/or a warning indicator may be displayed.
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| Conditions for Clearing the DTC |
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The electric parking brake module clears the history DTC when a current DTC is not detected in 40 ignition cycles.
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The condition for setting the DTC is no longer present.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
With a scan tool, perform the Parking Brake Actuator DTC Reset procedure. Verify DTC C028A is not set.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Electric Parking Brake Module replacement, setup, and programming.
