AutoCodes – GMC – C1114 2018 GMC Sierra

C1114 2018 GMC Sierra Code - Trailer Brake Control Solenoids Control Circuit Malfunction

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: C1114 2018 GMC Sierra indicates Trailer Brake Control Solenoids Control Circuit Malfunction.
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 304

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1114 2018 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 C1114 2018 GMC Sierra - Trailer Brake Control Solenoids Control Circuit Malfunction - AutoCodes.com — C1114 2018 GMC Sierra Code - Trailer Brake Control Solenoids Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C1114 2018 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 C1114 2018 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 C1114 2018 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 C1114 2018 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 C1114 2018 GMC Sierra Code

1. What does the OBDII code C1114 mean on a 2018 GMC Sierra?

C1114 refers to a "Trailer Brake Control Solenoids Control Circuit Malfunction," indicating a problem in the voltage or signal within the trailer brake control circuit.

2. What are the common symptoms of code C1114 in a 2018 GMC Sierra?

Symptoms may include the trailer brakes not functioning, a warning light on the dashboard, or a "Service Trailer Brake System" message appearing.

3. What causes code C1114 in a 2018 GMC Sierra?

Common causes include damaged wiring, corroded trailer brake connectors, a faulty trailer brake control module, or a malfunctioning solenoid.

4. Can a faulty trailer brake control module cause the C1114 code?

Yes, a defective trailer brake control module can trigger this code if it fails to properly communicate with the solenoid circuit.

5. How can I troubleshoot the C1114 code on my GMC Sierra?

Inspect the trailer brake wiring and connectors for damage or corrosion, test the solenoids for proper operation, and verify the functionality of the trailer brake control module.

6. Is it safe to drive with the C1114 code active?

While the truck may still be drivable, towing a trailer without functional brakes can be dangerous. It's best to address the issue promptly.

7. How do I fix the C1114 code on my 2018 GMC Sierra?

Repairs may include replacing damaged wires, cleaning corroded connectors, or replacing the trailer brake control module or solenoid if found defective.

8. Can a bad trailer brake solenoid cause the C1114 code?

Yes, a malfunctioning solenoid can prevent the trailer brakes from receiving proper voltage, triggering this code.

9. How much does it cost to repair the C1114 code on a GMC Sierra?

Repair costs vary depending on the issue. Replacing a solenoid or fixing wiring may cost $50-$200, while a new trailer brake control module could cost $300-$600.

10. Can a software update fix the C1114 code on a 2018 GMC Sierra?

In some cases, a software update to the trailer brake control module may resolve communication issues, but it depends on the specific cause of the malfunction.