C111B 2018 GMC Sierra Code - Trailer Brake Power Control Module System Voltage
Quick Answer
The C111B diagnostic trouble code (DTC) specifically relates to the Trailer Brake Power Control Module System Voltage in a 2018 GMC Sierra. Common causes include Wiring issues such as a short circuit or open circuit, Faulty trailer brake power control module, Blown fuse related to the trailer brake system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C111B 2018 GMC Sierra indicates Trailer Brake Power Control Module System Voltage.
- Common causes
- Common causes include Wiring issues such as a short circuit or open circuit, Faulty trailer brake power control module, Blown fuse related to the trailer brake system.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code C111B 2018 GMC Sierra Description
The C111B diagnostic trouble code (DTC) specifically relates to the Trailer Brake Power Control Module System Voltage in a 2018 GMC Sierra. This code indicates that there is an issue with the voltage supply to the trailer brake power control module. The trailer brake power control module is responsible for managing the power distribution to the trailer brakes, ensuring they function properly when the vehicle is towing a trailer.
Common Causes of C111B 2018 GMC Sierra
- Wiring issues such as a short circuit or open circuit.
- Faulty trailer brake power control module.
- Blown fuse related to the trailer brake system.
- Malfunctioning battery affecting voltage supply.
- Corrosion or damage to electrical connections.
Symptoms of C111B 2018 GMC Sierra
- Erratic braking behavior when towing a trailer.
- Trailer brake warning light illuminated on the dashboard.
- Inconsistent trailer brake response.
- Complete failure of trailer brakes.
How to Fix C111B 2018 GMC Sierra
- Begin by inspecting the wiring harness for any visible damage or corrosion. Repair or replace any damaged wires.
- Check the trailer brake power control module for proper functioning. Replace if necessary.
- Test the fuses related to the trailer brake system and replace any blown fuses.
- Verify the battery voltage and connections to ensure proper power supply to the trailer brake system.
- Clear the DTC and test the trailer brakes to ensure they are functioning correctly.
Cost to Fix C111B 2018 GMC Sierra
The typical repair costs for addressing the C111B code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new trailer brake power control module, wiring harness, or fuses can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost could range from $200 to $800 or more, depending on the extent of the repairs needed. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the vehicle.
Tech Notes for C111B 2018 GMC Sierra
C111B:07 Trailer Brake Power Control Module System Voltage Above Threshold
C111B:5A Trailer Brake Power Control Module System Voltage Plausibility Failure
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