C111B
Trailer Brake Power Control Module System Voltage Voltage Below Threshold
C111B is an OBD-II diagnostic trouble code meaning: Trailer Brake Power Control Module System Voltage Voltage Below Threshold. Common causes: battery or alternator problems, damaged wiring harness. Estimated repair cost: $56–167.
Symptoms
- Trailer brakes do not work
- The brake system fault indicator lights up
- Reduced trailer braking performance
Causes
- Battery or alternator problems
- Damaged wiring harness
- Trailer brake control module malfunction
- Short circuit in the circuit
- Poor contact in connectors
How to Fix
- Check the voltage on the battery and generator
- Inspect the wiring harness for damage
- Check the control module connectors for oxidation or poor contact.
- Test the trailer brake control module
- Replace faulty components
Related codes
FAQ
What does the C111B code mean?
C111B is an OBD-II diagnostic trouble code that indicates: Trailer Brake Power Control Module System Voltage Voltage Below Threshold
What causes a C111B error code?
The most common causes of C111B include: Battery or alternator problems; Damaged wiring harness; Trailer brake control module malfunction; Short circuit in the circuit.
How do I fix a C111B diagnostic trouble code?
To fix C111B: Check the voltage on the battery and generator. Inspect the wiring harness for damage. Check the control module connectors for oxidation or poor contact.. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C111B?
Limited driving only, diagnose soon
How much does it cost to fix C111B?
The estimated repair cost for C111B is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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