C1118 2017 GMC Sierra Code - Trailer Brake Control Sensitivity Switch Circuit 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
- C1118 2017 GMC Sierra indicates Trailer Brake Control Sensitivity Switch Circuit 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.
Code C1118 2017 GMC Sierra Description
What are the Possible Causes of the DTC C1118 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 C1118 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 C1118 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.
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Frequently Asked Questions about C1118 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code C1118 in a 2017 GMC Sierra related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction?
The common symptoms include the trailer brake system not working properly, dashboard warning lights related to the trailer brake system, and potential issues with the trailer's braking performance.
2. What are the possible causes of OBDII code C1118 in a 2017 GMC Sierra?
Possible causes of this code include a faulty sensitivity switch, damaged wiring or connectors in the trailer brake system, issues with the trailer brake controller module, or a malfunction in the vehicle's onboard diagnostic system.
3. How can I diagnose the Trailer Brake Control Sensitivity Switch Circuit Malfunction in my 2017 GMC Sierra?
Diagnosing this issue involves checking the wiring and connectors in the trailer brake system, testing the sensitivity switch for proper functionality, and using a diagnostic scanner to retrieve the specific trouble codes present.
4. Can I still safely tow a trailer with my 2017 GMC Sierra if OBDII code C1118 is triggered?
It is not recommended to tow a trailer if the trailer brake system is not functioning correctly. Ensure the issue is diagnosed and repaired before towing to prevent potential safety hazards.
5. Are there any simple repair tips for fixing OBDII code C1118 in a 2017 GMC Sierra?
Some simple repair tips include checking and tightening the wiring connections in the trailer brake system, replacing a faulty sensitivity switch if needed, and resetting the trouble codes after making repairs.
6. Is it necessary to visit a mechanic for OBDII code C1118 in a 2017 GMC Sierra, or can I fix it myself?
Depending on your level of automotive knowledge and experience, you may be able to diagnose and repair this issue yourself. However, if you are unsure or if the problem persists after basic troubleshooting, it is recommended to seek professional help.
7. Will OBDII code C1118 cause any long-term damage to my 2017 GMC Sierra if left untreated?
Leaving this code untreated can result in potential safety risks while towing a trailer due to the malfunctioning trailer brake system. It is advisable to address this issue promptly to avoid any long-term damage or safety concerns.
8. Can extreme weather conditions affect the sensitivity switch circuit and trigger OBDII code C1118 in a 2017 GMC Sierra?
Extreme weather conditions, such as moisture or corrosion from exposure to salt on the roads, can potentially impact the sensitivity switch circuit and lead to the malfunction triggering this trouble code.
9. How much does it typically cost to repair OBDII code C1118 related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction in a 2017 GMC Sierra?
The cost of repair can vary depending on the specific cause of the issue and whether you choose to fix it yourself or seek professional help. Costs may include parts replacement, labor fees, and diagnostic charges.
10. Are there any recalls or service bulletins related to OBDII code C1118 in a 2017 GMC Sierra?
It is advisable to check with your local GMC dealership or visit the manufacturer's website to see if there are any recalls or service bulletins addressing this specific OBDII code and related issues in your vehicle.
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