Electronic Parking Brake Control Module Fault
The electronic parking brake control module has detected a malfunction.
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What it means (plain English)
The parking brake system isn’t working because the control module found an error in its operation.
What the computer is actually seeing
The parking brake control module monitors the performance of the electronic parking brake system, including the position of the parking brake actuator. It expects to see proper signals and inputs corresponding to the driver's commands.
What a healthy reading looks like
The control module checks for voltage between 0.5V and 4.5V on the parking brake switch during operation and expects actuator position feedback within 0-100% of its range.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the parking brake switch for proper function. Measure voltage at the switch; it should be around 12V when activated.
- 22. Inspect the wiring and connectors for damage, corrosion, or loose connections between the control module and the actuator. Repair any issues found.
- 33. Verify the correct operation of the electronic parking brake actuator. Measure its position feedback; it should respond properly to commands from the control module.
- 44. If no issues are found, perform a scan of the control module. If it has stored codes, note them for further diagnostics.
- 55. If the control module shows internal faults but no external ones are evident, consider replacing the parking brake control module.
Common causes
- Faulty parking brake control module
- Wiring issue between control module and actuator
- Malfunctioning parking brake switch
- Connector corrosion or poor contact
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It’s relatively safe but should be fixed soon as the electronic parking brake may not hold the vehicle parked properly.
Will this code come back after clearing it?
If the underlying issue isn’t resolved, yes, it will likely return after a short while.
Why does this code sometimes pair with B1592?
They can pair because both codes relate to faults in the electronic parking brake system, indicating multiple potential points of failure.
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