AutoCodes – GMC – C111A 2017 GMC Sierra

C111A 2017 GMC Sierra Code - Trailer Brake Power Control Module

Quick Answer

The internal fault detection is handled inside the Trailer Brake Power Control Module. Common causes include Faulty Trailer Brake Power Control Module. 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: C111A 2017 GMC Sierra indicates Trailer Brake Power Control Module.
Common causes: Common causes include Faulty Trailer Brake Power Control Module.
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 294

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 19, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C111A 2017 GMC Sierra Description

The internal fault detection is handled inside the Trailer Brake Power Control Module. No external circuits are involved. The Trailer Brake Power Control Module runs the program to detect an internal fault when power-up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range. The Diagnostic Trouble Code (DTC) will be set when the Trailer Brake Power Control Module has detected an internal malfunction.

OBDII Code C111A 2017 GMC Sierra - Trailer Brake Power Control Module - AutoCodes.com — C111A 2017 GMC Sierra Code - Trailer Brake Power Control Module

What does this mean?

What are the Possible Causes of the DTC C111A 2017 GMC Sierra?

Faulty Trailer Brake Power Control Module

How to Fix the DTC C111A 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C111A 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 C111A 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 C111A 2017 GMC Sierra Code

1. What does OBDII code C111A mean on a 2017 GMC Sierra related to the Trailer Brake Power Control Module?

OBDII code C111A indicates a communication issue with the Trailer Brake Power Control Module in your 2017 GMC Sierra.

2. What are the common symptoms of OBDII code C111A in a 2017 GMC Sierra?

Common symptoms of code C111A may include trailer brake system malfunctions, warning lights on the dashboard, and loss of trailer brake control.

3. What are the possible causes of OBDII code C111A on a 2017 GMC Sierra?

Potential causes of code C111A can include damaged wiring, faulty connectors, a malfunctioning control module, or a communication breakdown within the trailer brake system.

4. How can I diagnose OBDII code C111A in my 2017 GMC Sierra?

To diagnose code C111A, you may use an OBDII scanner to retrieve the specific fault codes, inspect the trailer brake system wiring for damage, and test the control module for proper functioning.

5. Can I still drive my 2017 GMC Sierra with OBDII code C111A?

It is not recommended to drive your GMC Sierra with unresolved code C111A, as it may affect the functionality of the trailer brake system and compromise safety while towing.

6. How can I repair OBDII code C111A on my 2017 GMC Sierra?

Repairing code C111A may involve repairing or replacing damaged wiring, checking and cleaning connectors, resetting the control module, or seeking assistance from a qualified technician.

7. Is it safe to tow a trailer with a 2017 GMC Sierra experiencing OBDII code C111A?

It is not safe to tow a trailer with a 2017 GMC Sierra showing code C111A, as it may lead to unpredictable trailer brake behavior and potential safety hazards.

8. Can I reset OBDII code C111A in a 2017 GMC Sierra by disconnecting the battery?

While disconnecting the battery may reset some fault codes, it is recommended to diagnose and address the root cause of code C111A to ensure proper functioning of the trailer brake system.

9. Will OBDII code C111A in a 2017 GMC Sierra cause the check engine light to illuminate?

Yes, code C111A related to the Trailer Brake Power Control Module can trigger the check engine light in a 2017 GMC Sierra due to the communication fault detected.

10. How much does it cost to repair OBDII code C111A on a 2017 GMC Sierra at a dealership?

The cost of repairing code C111A at a dealership can vary depending on the specific diagnosis, parts needed, and labor costs, so it's recommended to obtain a detailed estimate before proceeding with the repairs.