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Engine-Codes – Chevrolet – C111B 2018 Chevrolet Silverado

C111B 2018 Chevrolet Silverado Code - Trailer Brake Power Control Module System Voltage

Quick Answer

The C111B diagnostic trouble code (DTC) specifically refers to an issue with the Trailer Brake Power Control Module System Voltage in a 2018 Chevrolet Silverado. Common causes include Wiring issues or shorts in the trailer brake power control module system, Malfunctioning trailer brake power control module, Faulty connections or corrosion in the electrical 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 Chevrolet Silverado indicates Trailer Brake Power Control Module System Voltage.
Common causes
Common causes include Wiring issues or shorts in the trailer brake power control module system, Malfunctioning trailer brake power control module, Faulty connections or corrosion in the electrical 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 07, 2024
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Code C111B 2018 Chevrolet Silverado Description

The C111B diagnostic trouble code (DTC) specifically refers to an issue with the Trailer Brake Power Control Module System Voltage in a 2018 Chevrolet Silverado. In simpler terms, this code indicates that there is a problem with the voltage levels within the trailer brake power control module system. The trailer brake power control module is a crucial component that helps control the braking system of a trailer being towed by the vehicle. When this system fails or malfunctions, it can have significant implications for the overall performance and safety of the vehicle and the trailer being towed.

OBDII Code C111B 2018 Chevrolet Silverado - Trailer Brake Power Control Module System Voltage
C111B 2018 Chevrolet Silverado Code - Trailer Brake Power Control Module System Voltage

Common Causes of C111B 2018 Chevrolet Silverado

  1. Wiring issues or shorts in the trailer brake power control module system
  2. Malfunctioning trailer brake power control module
  3. Faulty connections or corrosion in the electrical system
  4. Issues with the vehicle's battery or charging system
  5. Water damage or exposure to the elements affecting the trailer brake system components

Symptoms of C111B 2018 Chevrolet Silverado

  1. Dashboard warning lights related to the trailer brake system
  2. Trailer brakes not working properly or not engaging at all
  3. Uneven braking or jerky braking while towing a trailer
  4. Loss of control over the trailer when braking
  5. Increased stopping distance when towing a trailer

How to Fix C111B 2018 Chevrolet Silverado

  1. Perform a thorough inspection of the trailer brake power control module system to identify the root cause of the voltage issue.
  2. Check and repair any damaged wiring or connections in the system.
  3. Test the trailer brake power control module for proper functionality and replace if necessary.
  4. Reset the vehicle's onboard computer system to clear the DTC and ensure proper operation.
  5. Conduct a test drive with a trailer attached to verify that the trailer brakes are working correctly.

Cost to Fix C111B 2018 Chevrolet Silverado

The cost of repairing the Trailer Brake Power Control Module System Voltage issue in a 2018 Chevrolet Silverado can vary depending on the specific cause of the problem and the parts needed for the repair. In general, the cost of replacing a trailer brake power control module can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or other components need to be replaced. It is recommended to consult with a qualified mechanic or dealership for an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates and diagnostic fees can vary, so it's advisable to inquire about these costs upfront.

What does this mean?

Tech Notes for C111B 2018 Chevrolet Silverado

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 2018 Chevrolet Silverado Code

1. What does the OBDII code C111B mean on a 2018 Chevrolet Silverado?

The code C111B indicates an issue with the Trailer Brake Power Control Module System Voltage, often related to low or unstable voltage in the system.

2. What are the common symptoms of the C111B code?

Symptoms may include the trailer brake system not functioning, a warning message on the dashboard, and reduced or no trailer braking performance.

3. What causes the C111B code on a 2018 Chevrolet Silverado?

Common causes include a weak or failing vehicle battery, poor electrical connections, damaged wiring, or a malfunctioning Trailer Brake Power Control Module.

4. How do I diagnose the C111B code?

Start by checking the vehicle battery voltage, inspecting wiring and connectors for damage or corrosion, and testing the Trailer Brake Power Control Module for proper operation.

5. Can a bad ground connection cause the C111B code?

Yes, a poor ground connection can lead to voltage issues in the trailer brake system and trigger the C111B code.

6. How can I fix the C111B code on my Silverado?

Repairs may include cleaning or tightening electrical connections, replacing damaged wiring, recharging or replacing the battery, or replacing the Trailer Brake Power Control Module if faulty.

7. Is it safe to tow a trailer with the C111B code active?

It is not recommended to tow with this code active, as the trailer brake system may not function properly, increasing the risk of accidents.

8. Can a faulty trailer cause the C111B code?

Yes, a trailer with damaged wiring or a short circuit can cause voltage issues in the trailer brake system and trigger the code.

9. How much does it cost to fix the C111B code?

Repair costs vary depending on the issue. A simple fix like cleaning connections may cost little to nothing, while replacing the Trailer Brake Power Control Module could cost several hundred dollars.

10. Does the C111B code require professional repair?

While some fixes, like inspecting wiring and connections, can be done at home, diagnosing and repairing module-related issues may require professional tools and expertise.

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