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Engine-Codes – GMC – C111B GMC

C111B GMC Code - Trailer Brake Power Control Module System Voltage

Quick Answer

The C111B GMC code indicates a problem with the Trailer Brake Power Control Module System Voltage in the vehicle. Common causes include Faulty Trailer Brake Power Control Module, Corroded or damaged wiring connections, Low battery voltage affecting the power supply. 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 GMC indicates Trailer Brake Power Control Module System Voltage.
Common causes
Common causes include Faulty Trailer Brake Power Control Module, Corroded or damaged wiring connections, Low battery voltage affecting the power supply.
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 Aug 30, 2024
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Code C111B GMC Description

The C111B GMC code indicates a problem with the Trailer Brake Power Control Module System Voltage in the vehicle. This module is responsible for controlling the power supply to the trailer brakes, ensuring they function correctly when the brakes are applied. When this system voltage is not within the specified range, it can lead to issues with the trailer brake system, affecting the vehicle's towing capabilities and overall safety.

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

Common Causes of C111B GMC

  1. Faulty Trailer Brake Power Control Module
  2. Corroded or damaged wiring connections
  3. Low battery voltage affecting the power supply
  4. Issues with the vehicle's electrical system
  5. Water or debris intrusion in the trailer brake system

Symptoms of C111B GMC

  1. Illumination of the trailer brake warning light on the dashboard
  2. Inconsistent or weak braking performance when towing a trailer
  3. Trailer brakes not engaging or responding properly
  4. Electrical issues such as flickering lights or other electrical malfunctions

How to Fix C111B GMC

  1. Perform a diagnostic scan to confirm the C111B code and identify the specific issue
  2. Inspect the Trailer Brake Power Control Module for any signs of damage or malfunction
  3. Check and repair any corroded or damaged wiring connections
  4. Test the battery voltage and ensure it is within the specified range
  5. Clear the code from the vehicle's computer system and test the trailer brake system for proper function

Cost to Fix C111B GMC

The typical repair costs for addressing the C111B GMC code can vary depending on the specific issue causing the problem. On average, the repair for this type of issue may range from $150 to $500, including parts and labor. However, it is important to note that the actual cost can be higher or lower based on the extent of the damage, the need for replacement parts, and the labor rates at the auto repair shop. It is recommended to consult with a professional mechanic to get an accurate estimate based on the vehicle's make and model.

What does this mean?

Tech Notes for C111B GMC

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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Information for Specific GMC Models

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 GMC Code

1. What are common symptoms of OBDII code C111B GMC?

- Common symptoms include trailer brake system malfunctions, warning lights on the dashboard, and issues with the trailer brake power control module.

2. What causes the OBDII code C111B GMC to trigger?

- The code C111B is triggered when the powertrain control module (PCM) detects a voltage discrepancy in the trailer brake power control module system.

3. How can I diagnose the issue related to code C111B GMC?

- Use a diagnostic scanner to retrieve the trouble codes, check the trailer brake system components for any visible damage or loose connections, and test the system voltage with a multimeter.

4. Can a faulty trailer brake power control module cause code C111B GMC?

- Yes, a malfunctioning trailer brake power control module can cause the code C111B to trigger due to voltage irregularities in the system.

5. What are some repair tips for fixing OBDII code C111B GMC?

- Inspect and repair any damaged wiring or connectors in the trailer brake system, replace the trailer brake power control module if necessary, and reset the trouble codes after the repairs.

6. Is it safe to drive with OBDII code C111B GMC active?

- It is not recommended to drive with the code C111B active, as it indicates potential issues with the trailer brake system that could affect braking performance while towing.

7. Can a DIY enthusiast fix OBDII code C111B GMC at home?

- Depending on their skill level, DIY enthusiasts may be able to diagnose and repair the issues related to code C111B by following repair manuals or online guides, but professional help may be needed for complex issues.

8. How much does it typically cost to repair OBDII code C111B GMC?

- The cost of repairing code C111B can vary widely depending on the underlying issue, but it may involve expenses for diagnostic tools, replacement parts, and labor at a mechanic's shop.

9. Will resetting the trouble codes make OBDII code C111B GMC go away permanently?

- Resetting the trouble codes may temporarily clear the code C111B, but if the underlying issue in the trailer brake power control module system is not fixed, the code is likely to reappear.

10. Is code C111B GMC a common issue in GMC vehicles?

- While not as common as some other OBDII codes, C111B can still occur in GMC vehicles with trailer brake systems, especially in cases of electrical faults or component failures.

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