C1118 2015 GMC Sierra Code - Trailer Brake Control Sensitivity Switch Circuit Malfunction
Quick Answer
The C1118 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a Trailer Brake Control Sensitivity Switch Circuit Malfunction. Common causes include Faulty sensitivity switch, Wiring issues in the circuit, Corrosion or damage to electrical connections. 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 2015 GMC Sierra indicates Trailer Brake Control Sensitivity Switch Circuit Malfunction.
- Common causes
- Common causes include Faulty sensitivity switch, Wiring issues in the circuit, Corrosion or damage to electrical connections.
- 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 C1118 2015 GMC Sierra Description
The C1118 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a Trailer Brake Control Sensitivity Switch Circuit Malfunction. This means that there is an issue with the sensitivity switch circuit that controls the trailer brake system on the vehicle. The trailer brake control system is responsible for applying the brakes on a trailer in sync with the vehicle's brakes, ensuring safe and smooth towing operations.
Common Causes of C1118 2015 GMC Sierra
- Faulty sensitivity switch
- Wiring issues in the circuit
- Corrosion or damage to electrical connections
- Malfunctioning trailer brake control module
- Issues with the trailer brake actuator
Symptoms of C1118 2015 GMC Sierra
- Inconsistent or delayed trailer brake response
- Uneven braking between the vehicle and trailer
- ABS (Anti-lock Braking System) warning light illuminated on the dashboard
- Trailer brakes locking up unexpectedly
- Decreased braking performance while towing a trailer
How to Fix C1118 2015 GMC Sierra
- Start by performing a thorough inspection of the sensitivity switch circuit, checking for any visible damage or corrosion on the wiring and connections.
- Test the sensitivity switch to determine if it is functioning properly or needs replacement.
- Check the trailer brake control module for any faults or malfunctions and replace if necessary.
- Inspect the trailer brake actuator for proper operation and replace it if found to be faulty.
- Clear the DTC from the vehicle's computer system and test the trailer brake system to ensure proper functionality.
Cost to Fix C1118 2015 GMC Sierra
The cost of repairing a Trailer Brake Control Sensitivity Switch Circuit Malfunction can vary depending on the extent of the issue and the specific parts that need to be replaced. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that labor rates and diagnostic fees can vary based on location, so it's advisable to consult with local auto repair shops for a more accurate estimate. Additionally, prices for OEM (Original Equipment Manufacturer) parts or aftermarket components can also impact the total repair cost.
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Frequently Asked Questions about C1118 2015 GMC Sierra Code
1. What does the OBDII code C1118 mean on a 2015 GMC Sierra?
The C1118 code indicates a "Trailer Brake Control Sensitivity Switch Circuit Malfunction," meaning there is an issue with the electrical circuit controlling the trailer brake sensitivity.
2. What are the common symptoms of the C1118 code on a 2015 GMC Sierra?
Symptoms may include the trailer brake system not working properly, a warning light on the dashboard, or difficulty adjusting the trailer brake sensitivity.
3. What causes the C1118 code to trigger on a 2015 GMC Sierra?
Common causes include a faulty trailer brake sensitivity switch, damaged wiring or connectors in the circuit, or a malfunctioning trailer brake control module.
4. Can I still drive my 2015 GMC Sierra with the C1118 code active?
Yes, you can drive the truck, but the trailer brake system may not function properly, which could compromise safety when towing.
5. How do I diagnose the C1118 code on my 2015 GMC Sierra?
Diagnose the issue by inspecting the trailer brake sensitivity switch, checking the wiring and connectors for damage, and testing the trailer brake control module with a scan tool.
6. What tools do I need to fix the C1118 code on a 2015 GMC Sierra?
You may need a multimeter, an OBDII scan tool, and basic hand tools to check and repair the switch, wiring, or control module.
7. How can I fix the C1118 code on my 2015 GMC Sierra?
Repair steps include replacing the faulty trailer brake sensitivity switch, repairing damaged wiring or connectors, or replacing the trailer brake control module if necessary.
8. How much does it cost to fix a C1118 code on a 2015 GMC Sierra?
Repair costs can vary but typically range from $100 to $300 for parts and labor, depending on whether the switch, wiring, or module needs replacing.
9. Can a faulty trailer brake control module cause the C1118 code?
Yes, a malfunctioning trailer brake control module can cause the C1118 code by failing to properly process trailer brake sensitivity inputs.
10. Do I need to reprogram the trailer brake control module after fixing the C1118 code?
In some cases, the module may need reprogramming or recalibration after replacement or repair. Consult the vehicle's service manual or a professional technician.
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