AutoCodes – GMC – C1116 2015 GMC Sierra

C1116 2015 GMC Sierra Code - Manual Trailer Brake Apply Request Signal 1 Malfunction

Quick Answer

The trailer brake control system has a control panel with the trailer gain and manual apply switches. Common causes include Faulty Trailer Brake Control Switch, Trailer Brake Control Switch harness is open or shorted, Trailer Brake Control Switch 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: C1116 2015 GMC Sierra indicates Manual Trailer Brake Apply Request Signal 1 Malfunction.
Common causes: Common causes include Faulty Trailer Brake Control Switch, Trailer Brake Control Switch harness is open or shorted, Trailer Brake Control Switch 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 187

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 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1116 2015 GMC Sierra Description

The trailer brake control system has a control panel with the trailer gain and manual apply switches. The switches are located on the instrument panel to the left of the steering column. The control panel and switches allow you to adjust the amount of output, referred to as trailer gain, available to the electric trailer brakes and allow you to manually apply the trailer brakes. The trailer brake control panel and switches are used along with the trailer brake display page on the driver information center to adjust and display power output to the trailer brakes.

OBDII Code C1116 2015 GMC Sierra - Manual Trailer Brake Apply Request Signal 1 Malfunction - AutoCodes.com — C1116 2015 GMC Sierra Code - Manual Trailer Brake Apply Request Signal 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC C1116 2015 GMC Sierra?

Faulty Trailer Brake Control Switch
Trailer Brake Control Switch harness is open or shorted
Trailer Brake Control Switch circuit poor electrical connection
Faulty Chassis Control Module-Auxiliary

How to Fix the DTC C1116 2015 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 C1116 2015 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 C1116 2015 GMC Sierra code?

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Need Help with the 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 C1116 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code C1116 in a 2015 GMC Sierra?

The common symptoms include the trailer brakes not applying properly when manually activated, warning lights on the dashboard, and potential issues with the trailer brake system.

2. What can cause the Manual Trailer Brake Apply Request Signal 1 Malfunction in a 2015 GMC Sierra?

Possible causes of this code include faulty wiring in the trailer brake system, a malfunctioning trailer brake controller, or issues with the brake switch.

3. How serious is the C1116 OBDII code in a 2015 GMC Sierra?

While the code itself may not affect the drivability of the vehicle, it can impact the functionality of the trailer brake system, which is crucial for safe towing. It is recommended to address this issue promptly.

4. Can I still drive my 2015 GMC Sierra with the C1116 code present?

It is generally safe to drive the vehicle with this code, but it is important to have the trailer brake system inspected and repaired to ensure proper functionality when towing.

5. How can I diagnose and repair the C1116 code in my 2015 GMC Sierra?

Diagnosis involves checking the wiring, connections, and components of the trailer brake system. Repair tips include repairing any damaged wiring, replacing faulty components, and resetting the system.

6. Will resetting the OBDII code C1116 make it go away permanently?

Resetting the code may temporarily clear the warning lights, but if the underlying issue causing the malfunction is not addressed, the code is likely to reappear.

7. Can a DIY enthusiast fix the C1116 code issue in a 2015 GMC Sierra?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue. However, complex electrical problems may require professional assistance.

8. How much does it cost to repair the Manual Trailer Brake Apply Request Signal 1 Malfunction in a 2015 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue. It may involve simple fixes like replacing a sensor or more extensive repairs to the wiring or trailer brake controller.

9. Is it necessary to use a specialized mechanic to address the C1116 code in a 2015 GMC Sierra?

While not always necessary, using a mechanic with experience in diagnosing and repairing trailer brake systems can ensure the issue is properly resolved and prevent future problems.

10. Can the C1116 code be a recurring problem in a 2015 GMC Sierra?

If the root cause of the code is not effectively addressed, it can potentially recur. Regular maintenance and inspection of the trailer brake system can help prevent the issue from happening again.