C111B 2015 GMC Sierra Code - Trailer Brake Power Control Module System Voltage
Quick Answer
The Chassis Control Module-Auxiliary receives inputs from the Trailer Brake Power Control Module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power Control Module circuit poor electrical connection. 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 2015 GMC Sierra indicates Trailer Brake Power Control Module System Voltage.
- Common causes
- Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power Control Module circuit poor electrical connection.
- 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.
Code C111B 2015 GMC Sierra Description
What are the Possible Causes of the DTC C111B 2015 GMC Sierra?
- Faulty Trailer Brake Power Control Module
- Trailer Brake Power Control Module harness is open or shorted
- Trailer Brake Power Control Module circuit poor electrical connection
- Faulty Chassis Control Module-Auxiliary
How to Fix the DTC C111B 2015 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
C111B:07 Trailer Brake Power Control Module System Voltage Above Threshold
C111B:5A Trailer Brake Power Control Module System Voltage Plausibility Failure
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C111B 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about C111B 2015 GMC Sierra Code
1. What does OBDII code C111B mean on a 2015 GMC Sierra?
C111B indicates an issue with the Trailer Brake Power Control Module System Voltage, typically signaling a problem with the electrical supply to the module.
2. What are the common symptoms of code C111B on a 2015 GMC Sierra?
Symptoms may include a "Service Trailer Brake System" message on the dashboard, non-functional trailer brakes, or inconsistent trailer braking performance.
3. What causes the C111B code to activate?
Common causes include a weak or failing battery, corroded or loose electrical connections, damaged wiring, or a faulty Trailer Brake Power Control Module.
4. Can a blown fuse cause the C111B code on a GMC Sierra?
Yes, a blown fuse in the trailer brake system circuit can interrupt power to the control module and trigger the C111B code.
5. How can I troubleshoot the C111B code on my 2015 GMC Sierra?
Start by checking the battery voltage, inspecting fuses related to the trailer brake system, and examining wiring and connectors for damage or corrosion.
6. Does the trailer brake control module need to be replaced to fix code C111B?
Not always. The issue could be resolved by repairing wiring, replacing a fuse, or addressing a low battery. Replace the module only if it is confirmed to be faulty.
7. Can towing a damaged trailer trigger the C111B code?
Yes, if the trailer’s wiring has shorts or faults, it can cause voltage issues in the truck's trailer brake system and trigger the code.
8. How much does it cost to fix the C111B code on a 2015 GMC Sierra?
Repair costs vary depending on the issue but typically range from $50 for minor wiring repairs to $500 or more for module replacement.
9. Can I still tow a trailer with the C111B code active?
It is not recommended, as the trailer brakes may not function properly, posing a safety risk.
10. Will clearing the C111B code fix the underlying issue?
No, clearing the code will not resolve the problem. The issue causing the voltage fault must be identified and fixed to prevent the code from returning.
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