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Engine-Codes – GMC – C111B 2016 GMC Sierra

C111B 2016 GMC Sierra Code - Trailer Brake Power Control Module System Voltage

Quick Answer

The C111B diagnostic trouble code (DTC) on a 2016 GMC Sierra relates to the Trailer Brake Power Control Module System Voltage. Common causes include Faulty trailer brake power control module, Wiring issues or loose connections in the trailer brake system, Corrosion or damage to the electrical components in 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 2016 GMC Sierra indicates Trailer Brake Power Control Module System Voltage.
Common causes
Common causes include Faulty trailer brake power control module, Wiring issues or loose connections in the trailer brake system, Corrosion or damage to the electrical components in 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code C111B 2016 GMC Sierra Description

The C111B diagnostic trouble code (DTC) on a 2016 GMC Sierra relates to the Trailer Brake Power Control Module System Voltage. This code indicates a problem with the voltage levels in the trailer brake power control module, which is responsible for controlling the power distribution to the trailer brakes. When this system voltage is outside the expected range, it can lead to issues with the trailer brake system, affecting the vehicle's towing capabilities and safety.

OBDII Code C111B 2016 GMC Sierra - Trailer Brake Power Control Module System Voltage
C111B 2016 GMC Sierra Code - Trailer Brake Power Control Module System Voltage

Common Causes of C111B 2016 GMC Sierra

  1. Faulty trailer brake power control module.
  2. Wiring issues or loose connections in the trailer brake system.
  3. Corrosion or damage to the electrical components in the trailer brake system.
  4. Voltage irregularities in the vehicle's electrical system.

Symptoms of C111B 2016 GMC Sierra

  1. Trailer brake system warning light illuminated on the dashboard.
  2. Inconsistent or weak trailer brake performance while towing.
  3. Difficulty stopping the vehicle and trailer combination.
  4. ABS system warning light may also be illuminated.

How to Fix C111B 2016 GMC Sierra

  1. Begin by inspecting the trailer brake power control module for any visible damage or signs of corrosion. Replace the module if necessary.
  2. Check the wiring and connections in the trailer brake system for any loose or damaged components. Repair or replace as needed.
  3. Test the voltage levels in the trailer brake power control module to ensure they are within the specified range. Adjust or replace any components that are not functioning correctly.
  4. Clear the DTC from the vehicle's onboard computer using a diagnostic tool to reset the system and ensure proper operation.
  5. Test drive the vehicle while towing a trailer to verify that the trailer brake system is functioning correctly and the warning lights are no longer illuminated.

Cost to Fix C111B 2016 GMC Sierra

The cost of repairing a C111B DTC related to the Trailer Brake Power Control Module System Voltage on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can add an additional $100 to $300. Overall, the total repair cost is estimated to be between $200 and $800. It is important to note that diagnosis time and labor rates can vary, so it is advisable to check with local auto repair shops for a more precise estimate.

What does this mean?

Tech Notes for C111B 2016 GMC Sierra

C111B:03 Trailer Brake Power Control Module System Voltage Below Threshold

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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C111B 2016 GMC Sierra Code

1. What is OBDII code C111B for a 2016 GMC Sierra related to Trailer Brake Power Control Module System Voltage?

- This code indicates a problem with the system voltage of the trailer brake power control module in a 2016 GMC Sierra.

2. What are the common symptoms of OBDII code C111B in a 2016 GMC Sierra?

- Common symptoms include trailer brake issues, warning lights on the dashboard, and potential loss of trailer brake functionality.

3. What are the possible causes of OBDII code C111B in a 2016 GMC Sierra?

- Causes may include a faulty trailer brake power control module, wiring issues, a weak battery, or a malfunctioning alternator.

4. How can I diagnose the OBDII code C111B in my 2016 GMC Sierra?

- Diagnosis involves checking the trailer brake system components, inspecting wiring for damage, testing the battery and alternator, and using a diagnostic scanner to read the code.

5. Can I still drive my 2016 GMC Sierra with OBDII code C111B present?

- It is not recommended to drive the vehicle with this code active, as it may affect the operation of the trailer brake system and compromise safety.

6. How do I repair OBDII code C111B in my 2016 GMC Sierra?

- Repair may involve replacing the trailer brake power control module, repairing damaged wiring, addressing battery or alternator issues, and clearing the trouble code.

7. Are there any DIY tips for fixing OBDII code C111B in a 2016 GMC Sierra?

- DIY enthusiasts can start by checking the trailer brake connections, inspecting fuses, testing the battery and alternator, and ensuring proper trailer wiring.

8. Is it necessary to reset the OBDII code C111B after fixing the issue in a 2016 GMC Sierra?

- Yes, it is important to clear the code using a diagnostic scanner after addressing the root cause to reset the system and ensure proper functionality.

9. How much does it typically cost to fix OBDII code C111B in a 2016 GMC Sierra at a repair shop?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for parts and labor, with total costs potentially ranging from $200 to $500 or more.

10. Can a mechanic help me with diagnosing and repairing OBDII code C111B in my 2016 GMC Sierra?

- Yes, a qualified mechanic with experience in automotive diagnostics and electrical systems can assist in accurately diagnosing and repairing the issue to ensure proper functionality.

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