AutoCodes – GMC – C111B 2017 GMC Sierra

C111B 2017 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 2017 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.

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Code Popularity 240

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C111B 2017 GMC Sierra Description

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. The Diagnostic Trouble Code (DTC) will be set when the Trailer Brake Power Control Module detects a short to ground, open, a short to voltage, or a plausibility failure on the trailer brake output circuit.

OBDII Code C111B 2017 GMC Sierra - Trailer Brake Power Control Module System Voltage - AutoCodes.com — C111B 2017 GMC Sierra Code - Trailer Brake Power Control Module System Voltage

What does this mean?

What are the Possible Causes of the DTC C111B 2017 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 2017 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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C111B 2017 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.

Need more information about the C111B 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

1. What are common symptoms of OBDII code C111B in a 2017 GMC Sierra related to the Trailer Brake Power Control Module System Voltage?

- Common symptoms include issues with the trailer brake system, such as erratic braking, loss of trailer brake functionality, or warning lights on the dashboard.

2. What can cause the OBDII code C111B to trigger in a 2017 GMC Sierra?

- The code C111B can be triggered by a malfunction in the trailer brake power control module system voltage, which may be caused by faulty wiring, a damaged control module, or issues with the vehicle's electrical system.

3. How serious is the OBDII code C111B in a 2017 GMC Sierra?

- The code C111B can affect the proper functionality of the trailer brake system, potentially compromising safety when towing. It is important to address this issue promptly to ensure the trailer brake system operates correctly.

4. Can I still drive my 2017 GMC Sierra with the OBDII code C111B triggered?

- It is not recommended to drive the vehicle with the code C111B triggered, especially if you are towing a trailer. Addressing the issue promptly is crucial to ensure the trailer brake system operates correctly.

5. How can I diagnose the OBDII code C111B in a 2017 GMC Sierra?

- Diagnosing the code C111B typically involves using a professional OBDII scanner to retrieve the specific fault codes related to the trailer brake power control module system voltage. Additionally, conducting a visual inspection of the wiring and components involved can help identify potential issues.

6. What are some repair tips for fixing the OBDII code C111B in a 2017 GMC Sierra?

- Repairing the code C111B may involve checking and repairing any damaged wiring, replacing the trailer brake power control module if necessary, and ensuring proper voltage supply to the system. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

7. Can I reset the OBDII code C111B in a 2017 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the underlying issue is not addressed. It is crucial to diagnose and repair the root cause of the problem to prevent the code from triggering again.

8. Is it safe to tow a trailer with a 2017 GMC Sierra if the OBDII code C111B is present?

- It is not safe to tow a trailer if the OBDII code C111B is present, as it indicates a potential issue with the trailer brake power control module system voltage. Ensure the problem is resolved before towing to prevent any safety risks.

9. How much does it typically cost to repair the OBDII code C111B in a 2017 GMC Sierra?

- The cost of repairing the code C111B can vary depending on the specific issue causing the fault. Costs may include parts and labor for replacing components, repairing wiring, or addressing electrical system issues. It is recommended to obtain a repair estimate from a qualified mechanic.

10. Can the OBDII code C111B in a 2017 GMC Sierra be prevented in the future?

- Regular maintenance and inspection of the trailer brake system, including the power control module and related components, can help prevent issues that may trigger the code C111B. Following proper towing procedures and addressing any warning signs promptly can also help avoid this problem.