Parking Brake Actuator Circuit Malfunction
What does C0147 mean?
The C0147 code means the vehicle's onboard diagnostic system has detected: Parking Brake Actuator Circuit Malfunction. This is a moderate severity code.
Common Symptoms
- Electronic parking brake warning light on
- Parking brake will not engage or release
- Parking brake stuck on
- Parking brake button not responding
- Hill hold assist not working
Probable Causes (Ranked by Likelihood)
- Failed electric parking brake actuator motor Very High
- Parking brake cable seized or broken High
- Parking brake control module fault Moderate
- Wiring issue to parking brake actuator Low
Step-by-Step Diagnostic Procedure
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Scan parking brake module for DTCs
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Test parking brake actuator with scan tool commands
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Check actuator motor for power and ground
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Inspect parking brake cables for seizure
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Verify parking brake switch input signal
Frequently Asked Questions
How does an electronic parking brake work?
Instead of a traditional hand lever or foot pedal, an electric motor at each rear caliper or a central motor with cables applies and releases the parking brake when a button is pressed.
Can I release a stuck electronic parking brake?
Some vehicles have an emergency manual release procedure. Check your owner's manual. A scan tool can also be used to command the actuator to release in many cases.
Will the electronic parking brake engage automatically in an emergency?
Many vehicles have a dynamic braking feature where holding the parking brake button while driving will apply the brakes progressively. This is a safety feature for brake failure situations.