C1116 2018 GMC Sierra Code - Manual Trailer Brake Apply Request Signal 1 Malfunction
Quick Answer
The C1116 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a Manual Trailer Brake Apply Request Signal 1 Malfunction. Common causes include Faulty wiring or connectors in the trailer brake system, Malfunctioning trailer brake controller, Corrosion or damage to sensors related to the manual trailer brake apply request signal. 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 2018 GMC Sierra indicates Manual Trailer Brake Apply Request Signal 1 Malfunction.
- Common causes
- Common causes include Faulty wiring or connectors in the trailer brake system, Malfunctioning trailer brake controller, Corrosion or damage to sensors related to the manual trailer brake apply request signal.
- 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 C1116 2018 GMC Sierra Description
The C1116 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a Manual Trailer Brake Apply Request Signal 1 Malfunction. This code is related to the vehicle's trailer brake system, specifically the signal that is sent when the driver manually applies the trailer brakes. The manual trailer brake apply request signal is crucial for controlling the braking force of the trailer independently of the vehicle's brakes. When this signal malfunctions, it can lead to issues with braking efficiency, control, and safety while towing a trailer.
Common Causes of C1116 2018 GMC Sierra
- Faulty wiring or connectors in the trailer brake system.
- Malfunctioning trailer brake controller.
- Corrosion or damage to sensors related to the manual trailer brake apply request signal.
- Issues with the vehicle's electrical system affecting the trailer brake signal.
- Water or debris intrusion in the trailer brake components.
Symptoms of C1116 2018 GMC Sierra
- Inconsistent or delayed response when manually applying the trailer brakes.
- Trailer brakes not engaging or engaging too aggressively.
- Warning light on the dashboard related to the trailer brake system.
- Difficulty controlling the trailer while braking.
How to Fix C1116 2018 GMC Sierra
- Begin by inspecting the wiring and connectors in the trailer brake system for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components.
- Check the trailer brake controller for proper functioning and calibration. Replace the controller if necessary.
- Inspect and test the sensors related to the manual trailer brake apply request signal. Replace any sensors that are malfunctioning.
- Clear the DTC from the vehicle's onboard computer using a diagnostic scanner.
- Test the trailer brake system to ensure that the manual trailer brake apply request signal is functioning correctly.
Cost to Fix C1116 2018 GMC Sierra
The cost of repairing a Manual Trailer Brake Apply Request Signal 1 Malfunction on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $150 and $400 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes from different shops to find the best price.
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Frequently Asked Questions about C1116 2018 GMC Sierra Code
What does the OBDII code C1116 mean on a 2018 GMC Sierra?
Code C1116 refers to a malfunction in the Manual Trailer Brake Apply Request Signal 1, indicating an issue with the trailer brake system's electrical signal.
What are common symptoms of code C1116 in a 2018 GMC Sierra?
Symptoms may include the trailer brakes not functioning properly, a "Service Trailer Brake System" warning on the dashboard, or difficulty manually applying trailer brakes.
What causes code C1116 on a 2018 GMC Sierra?
Common causes include a faulty trailer brake control module, damaged wiring or connectors, or issues with the manual brake apply switch.
Can I still tow a trailer if code C1116 is present on my 2018 GMC Sierra?
It is not recommended to tow a trailer until the issue is resolved, as the trailer brakes may not function correctly, posing a safety risk.
How do I diagnose code C1116 on a 2018 GMC Sierra?
Start by inspecting the wiring and connectors for the trailer brake system, checking for damage or corrosion, and testing the manual brake apply switch with a multimeter.
Is code C1116 a serious issue for my 2018 GMC Sierra?
Yes, it can be serious as it affects the trailer brake system, compromising towing safety and control. Prompt diagnosis and repair are recommended.
How can I fix code C1116 on my 2018 GMC Sierra?
Repair may involve replacing the manual brake apply switch, repairing damaged wiring or connectors, or replacing the trailer brake control module.
Can a faulty trailer brake apply switch trigger code C1116?
Yes, a malfunctioning manual trailer brake apply switch can cause this code by failing to send the proper signal to the brake control module.
Does code C1116 require professional repair?
While some experienced DIYers may be able to resolve the issue, professional diagnosis is often recommended for trailer brake system problems to ensure safe operation.
Will clearing the code C1116 solve the problem on a 2018 GMC Sierra?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return until proper repairs are made.
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