AutoCodes – GMC – C1116 2017 GMC Sierra

C1116 2017 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 2017 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 219

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 2017 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 2017 GMC Sierra - Manual Trailer Brake Apply Request Signal 1 Malfunction - AutoCodes.com — C1116 2017 GMC Sierra Code - Manual Trailer Brake Apply Request Signal 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC C1116 2017 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 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 C1116 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 C1116 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 C1116 2017 GMC Sierra Code

1. What does the OBDII code C1116 mean on a 2017 GMC Sierra?

C1116 indicates a malfunction in the Manual Trailer Brake Apply Request Signal 1, which is part of the trailer brake control system.

2. What are common symptoms of the C1116 code?

Symptoms include the trailer brakes not engaging when manually applied, warning messages or lights on the dashboard, and possible loss of trailer braking functionality.

3. What causes the C1116 code to appear?

Common causes include a faulty trailer brake control switch, damaged wiring or connectors in the trailer brake circuit, or a malfunctioning trailer brake control module.

4. Can the C1116 code be triggered by a problem with the trailer itself?

Yes, issues such as a short in the trailer wiring, a faulty trailer brake system, or an incompatible trailer brake controller can trigger the code.

5. How do you diagnose the C1116 code on a 2017 GMC Sierra?

Diagnosis involves scanning for codes, inspecting the trailer brake control switch, checking wiring and connectors, and testing the trailer brake control module for proper operation.

6. Can I still drive my GMC Sierra with the C1116 code active?

Yes, but trailer braking functionality may be compromised, making towing unsafe. Itâ€™s recommended to address the issue promptly.

7. How do I fix the C1116 code?

Repairs may include replacing the trailer brake control switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the trailer brake control module.

8. Is the C1116 code covered under warranty for a 2017 GMC Sierra?

It depends on the vehicleâ€™s warranty status and coverage. Consult your GMC dealership for specific details.

9. Can a low battery voltage cause the C1116 code?

While uncommon, low battery voltage or electrical issues in the vehicleâ€™s system can potentially cause malfunctions in the trailer brake control system.

10. How much does it cost to repair the C1116 code on a 2017 GMC Sierra?

Repair costs can vary depending on the specific issue but may range from $100 for simple wiring repairs to $500 or more for module replacement.