AutoCodes – GMC – C111A GMC

C111A GMC 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 GMC 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 429

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
Comments
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Code C111A GMC 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 GMC - Trailer Brake Power Control Module - AutoCodes.com — C111A GMC Code - Trailer Brake Power Control Module

What does this mean?

What are the Possible Causes of the DTC C111A GMC?

Faulty Trailer Brake Power Control Module

How to Fix the DTC C111A GMC?

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 GMC 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 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

C111A 2014 GMC Sierra — Trailer Brake Power Control Module
C111A 2015 GMC Sierra — Trailer Brake Power Control Module
C111A 2016 GMC Sierra — Trailer Brake Power Control Module
C111A 2017 GMC Sierra — Trailer Brake Power Control Module
C111A 2018 GMC Sierra — Trailer Brake Power Control Module

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.