AutoCodes – Cadillac – C1116 Cadillac

C1116 Cadillac 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 Cadillac 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 977

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 Cadillac 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 Cadillac - Manual Trailer Brake Apply Request Signal 1 Malfunction - AutoCodes.com — C1116 Cadillac Code - Manual Trailer Brake Apply Request Signal 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC C1116 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What does the OBDII code C1116 mean on a Cadillac?

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 the common symptoms of code C1116 in a Cadillac?

Symptoms may include the trailer brakes not engaging properly, a warning light on the dashboard, or difficulty controlling the trailer braking manually.

3. What causes the C1116 code to appear?

Common causes include a faulty trailer brake control switch, damaged wiring or connectors, or issues with the trailer brake control module.

4. Is it safe to drive with a C1116 code on a Cadillac?

While it may be safe to drive without a trailer attached, towing a trailer could be unsafe due to impaired braking control.

5. How can I diagnose the C1116 code on my Cadillac?

Start by inspecting the trailer brake control switch, related wiring, and connectors for damage or corrosion. You may also need to test the switch and module functionality with a multimeter.

6. Can a faulty trailer brake controller cause the C1116 code?

Yes, a malfunctioning trailer brake controller can trigger the C1116 code if it fails to send the proper signal.

7. How do I fix the C1116 code on my Cadillac?

Repair or replace any damaged wiring, connectors, or the trailer brake control switch. In some cases, replacing the trailer brake control module may be necessary.

8. Will clearing the code fix the C1116 issue?

Clearing the code may temporarily reset the warning, but the issue will return if the underlying problem is not resolved.

9. Can a software update resolve the C1116 code?

In rare cases, a software update for the trailer brake control module might fix the issue, but this is only applicable if the manufacturer has identified a programming bug.

10. Do I need professional help to fix the C1116 code?

If youâ€™re not experienced with electrical diagnostics and repairs, itâ€™s recommended to seek professional assistance to avoid further damage or safety risks.