AutoCodes – GMC – C1116 2016 GMC Sierra

C1116 2016 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 2016 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 200

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 2016 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 2016 GMC Sierra - Manual Trailer Brake Apply Request Signal 1 Malfunction - AutoCodes.com — C1116 2016 GMC Sierra Code - Manual Trailer Brake Apply Request Signal 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC C1116 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

What does the OBDII code C1116 mean on a 2016 GMC Sierra?

Code C1116 indicates a malfunction in the Manual Trailer Brake Apply Request Signal 1, suggesting an issue with the trailer brake system's manual operation.

What are common symptoms of code C1116 on a 2016 GMC Sierra?

Common symptoms include reduced or no manual trailer brake function, a brake warning light on the dashboard, or a trailer brake system error message.

What causes code C1116 on a 2016 GMC Sierra?

Possible causes include a faulty trailer brake control module, damaged wiring or connectors in the trailer brake system, or a malfunctioning manual brake lever or switch.

Can code C1116 affect trailer braking performance?

Yes, this code can impact manual trailer braking, potentially reducing control and safety when towing a trailer that requires manual brake inputs.

How can I diagnose code C1116 on a 2016 GMC Sierra?

Start by inspecting the trailer brake control module, manual brake lever, and associated wiring and connectors for damage, corrosion, or loose connections.

Is it safe to drive with code C1116 on a 2016 GMC Sierra?

While you can drive, towing a trailer without proper manual brake functionality can be unsafe. It's recommended to address the issue promptly.

How do I fix code C1116 on a 2016 GMC Sierra?

Repairs may involve replacing a damaged trailer brake control module, repairing or replacing faulty wiring, or servicing the manual brake lever assembly.

Can a faulty trailer brake control module cause code C1116?

Yes, a malfunctioning trailer brake control module is a common cause of this code and can disrupt the signal for manual trailer brake application.

How much does it cost to repair code C1116 on a 2016 GMC Sierra?

Repair costs vary but typically range from $100 to $500 depending on whether the issue is with the module, wiring, or manual brake lever.

Can I clear code C1116 without repairing the issue?

Clearing the code without addressing the root cause may temporarily remove the warning, but the problem will likely persist and may re-trigger the code.