C1118 Buick 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 Buick 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 Buick Description
What are the Possible Causes of the DTC C1118 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What are the common symptoms of OBDII code C1118 in a Buick related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction?
- Common symptoms include the trailer brake system not functioning properly, the trailer brakes locking up unexpectedly, or dashboard warning lights related to the trailer brake system.
2. What are the possible causes of OBDII code C1118 in a Buick?
- The code C1118 in a Buick may be triggered by issues such as a faulty sensitivity switch, damaged wiring in the trailer brake control circuit, or a malfunctioning trailer brake controller.
3. How can I diagnose the Trailer Brake Control Sensitivity Switch Circuit Malfunction in my Buick?
- Diagnosis typically involves inspecting the sensitivity switch, checking the wiring for any damage or corrosion, and testing the trailer brake controller to ensure it is functioning properly.
4. Can I still drive my Buick with OBDII code C1118 present?
- It is not recommended to drive with the code C1118 active, as it indicates a malfunction in the trailer brake control system that could compromise safety while towing.
5. How can I repair OBDII code C1118 in my Buick?
- Repairing code C1118 may involve replacing the sensitivity switch, repairing or replacing damaged wiring, or diagnosing and fixing any issues with the trailer brake controller.
6. Are there any DIY tips for troubleshooting OBDII code C1118 in a Buick?
- DIY tips include checking the trailer brake system connections, inspecting the sensitivity switch for proper function, and ensuring all wiring is secure and free of damage.
7. Will clearing the OBDII code C1118 in my Buick resolve the issue?
- Clearing the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the Trailer Brake Control Sensitivity Switch Circuit Malfunction.
8. Is it necessary to visit a dealership or mechanic for OBDII code C1118 repair?
- While some DIY troubleshooting can be done, it is recommended to consult a dealership or qualified mechanic to accurately diagnose and repair the Trailer Brake Control Sensitivity Switch Circuit Malfunction.
9. How much does it typically cost to repair OBDII code C1118 in a Buick?
- The cost of repairing code C1118 can vary depending on the specific issue causing the malfunction, but it may involve parts and labor costs ranging from $100 to $500 or more.
10. Can ignoring OBDII code C1118 cause further damage to my Buick?
- Ignoring code C1118 can lead to potential safety hazards while towing, such as loss of trailer brake functionality or brakes locking up unexpectedly, which could result in accidents or damage to the vehicle.
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