C1115 2015 GMC Sierra Code - Manual Trailer Brake Apply Request Switch Signal
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
- C1115 2015 GMC Sierra indicates Manual Trailer Brake Apply Request Switch Signal.
- 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 C1115 2015 GMC Sierra Description
What are the Possible Causes of the DTC C1115 2015 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 C1115 2015 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.
Code Tech Notes
C1115:5A Manual Trailer Brake Apply Request Switch Signal Plausibility Failure
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1115 2015 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 C1115 2015 GMC Sierra Code
1. What does the OBDII code C1115 mean on a 2015 GMC Sierra?
C1115 indicates an issue with the Manual Trailer Brake Apply Request Switch Signal, which is part of the trailer brake control system.
2. What are the symptoms of code C1115 on a 2015 GMC Sierra?
Common symptoms include the trailer brake system not functioning properly, a warning message on the dashboard, or the trailer brakes failing to engage when the manual brake switch is used.
3. What causes the C1115 code to appear?
The code can be triggered by a faulty manual trailer brake switch, damaged wiring or connectors, or an issue with the trailer brake control module.
4. Can I still tow safely with a C1115 code on my 2015 GMC Sierra?
Towing may be unsafe because the trailer brake system might not function properly. It's best to address the issue before towing.
5. How do I diagnose the C1115 code on my 2015 GMC Sierra?
Start by inspecting the manual trailer brake switch, connectors, and wiring for damage or wear. Use a scan tool to confirm the fault and test the switch for proper operation.
6. How do I fix the C1115 code on a 2015 GMC Sierra?
Repairs may involve replacing the manual trailer brake switch, repairing damaged wiring, or reprogramming or replacing the trailer brake control module.
7. Is the manual trailer brake switch easy to replace?
Yes, the manual trailer brake switch is generally easy to replace with basic tools, but proper diagnosis is essential before replacing it.
8. What tools are needed to troubleshoot the C1115 code?
You’ll need a scan tool capable of reading and clearing ABS and trailer brake system codes, a multimeter, and basic hand tools for inspection and repair.
9. Can a damaged trailer wiring harness cause the C1115 code?
Yes, a damaged or shorted trailer wiring harness can affect the signal from the manual trailer brake switch and trigger the code.
10. Will clearing the C1115 code fix the problem permanently?
Clearing the code will only temporarily remove it. The underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for C1115 2015 GMC Sierra OBDII Code
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