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Engine-Codes – GMC – C1115 2014 GMC Sierra

C1115 2014 GMC Sierra Code - Manual Trailer Brake Apply Request Switch Signal

Quick Answer

The C1115 code for a 2014 GMC Sierra indicates a problem with the Manual Trailer Brake Apply Request Switch Signal. Common causes include Faulty Manual Trailer Brake Apply Request Switch, Wiring issues or shorts in the trailer brake system, Malfunctioning trailer brake control module. 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 2014 GMC Sierra indicates Manual Trailer Brake Apply Request Switch Signal.
Common causes
Common causes include Faulty Manual Trailer Brake Apply Request Switch, Wiring issues or shorts in the trailer brake system, Malfunctioning trailer brake control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code C1115 2014 GMC Sierra Description

The C1115 code for a 2014 GMC Sierra indicates a problem with the Manual Trailer Brake Apply Request Switch Signal. This code is related to the trailer brake system in the vehicle. The Manual Trailer Brake Apply Request Switch is a component that allows the driver to manually apply the trailer brakes independently of the vehicle's brakes. When this signal is not functioning properly, it can lead to issues with the trailer brake system, affecting the overall towing performance and safety of the vehicle.

OBDII Code C1115 2014 GMC Sierra - Manual Trailer Brake Apply Request Switch Signal
C1115 2014 GMC Sierra Code - Manual Trailer Brake Apply Request Switch Signal

Common Causes of C1115 2014 GMC Sierra

  1. Faulty Manual Trailer Brake Apply Request Switch
  2. Wiring issues or shorts in the trailer brake system
  3. Malfunctioning trailer brake control module
  4. Corrosion or damage to electrical connections
  5. Issues with the vehicle's onboard computer system

Symptoms of C1115 2014 GMC Sierra

  1. Erratic trailer braking response
  2. Inconsistent trailer brake activation
  3. Trailer brakes not engaging when manually applied
  4. Dashboard warning light related to trailer brake system
  5. Decreased braking performance while towing

How to Fix C1115 2014 GMC Sierra

  1. Begin by inspecting the Manual Trailer Brake Apply Request Switch for any visible damage or signs of malfunction. Replace the switch if necessary.
  2. Check the wiring harness and connections for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the trailer brake control module for proper functionality. Replace if found to be faulty.
  4. Clear the diagnostic trouble codes from the vehicle's computer and test the trailer brake system to ensure proper operation.
  5. If the issue persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix C1115 2014 GMC Sierra

The cost of repairing a Manual Trailer Brake Apply Request Switch Signal issue can vary depending on the specific cause of the problem. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue could be anywhere from $150 to $500. It's important to note that these are rough estimates and actual costs may vary based on the location, labor rates, and specific vehicle details. Be sure to consult with a qualified mechanic for an accurate diagnosis and cost estimate.

What does this mean?

Tech Notes for C1115 2014 GMC Sierra

C1115:08 Manual Trailer Brake Apply Request Switch Signal Invalid

C1115:5A Manual Trailer Brake Apply Request Switch Signal Plausibility Failure

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1115 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code C1115 on a 2014 GMC Sierra related to the Manual Trailer Brake Apply Request Switch Signal?

- The common symptoms include the trailer brake system not responding properly or the manual trailer brake apply request switch not functioning as intended.

2. What are the possible causes of OBDII code C1115 on a 2014 GMC Sierra?

- The code C1115 can be triggered by a faulty manual trailer brake apply request switch signal, wiring issues, or a malfunction in the trailer brake system.

3. How can I diagnose the cause of OBDII code C1115 on my 2014 GMC Sierra?

- To diagnose the issue, you can start by checking the wiring and connections related to the manual trailer brake apply request switch. Inspect for any visible damage or loose connections.

4. Can a DIY enthusiast repair OBDII code C1115 on a 2014 GMC Sierra?

- Depending on the specific cause, a DIY enthusiast may be able to repair the issue by replacing the faulty manual trailer brake apply request switch or addressing any wiring issues. However, professional help may be required for more complex problems.

5. Is it safe to continue driving with OBDII code C1115 on a 2014 GMC Sierra?

- It is not recommended to continue driving with unresolved OBDII code C1115, as it can affect the functionality of the trailer brake system, compromising safety while towing.

6. How much does it typically cost to repair OBDII code C1115 on a 2014 GMC Sierra?

- The cost of repairing OBDII code C1115 can vary depending on the underlying cause. Simple fixes like replacing the manual trailer brake apply request switch may be relatively affordable, while complex wiring issues could be more costly.

7. Can OBDII code C1115 on a 2014 GMC Sierra be reset without fixing the underlying issue?

- Resetting the code without addressing the root cause is not recommended, as the issue will likely persist and trigger the code again. It's important to diagnose and repair the problem to ensure proper functioning of the trailer brake system.

8. Are there any common related codes that may appear alongside OBDII code C1115 on a 2014 GMC Sierra?

- Depending on the specific circumstances, related codes such as C1114 (Manual Trailer Brake Apply Request Circuit) or C1116 (Manual Trailer Brake Apply Request Signal Missing) may also be present.

9. How can I prevent OBDII code C1115 from recurring on my 2014 GMC Sierra?

- Regularly inspecting and maintaining the trailer brake system, including the manual trailer brake apply request switch and related wiring, can help prevent the recurrence of OBDII code C1115.

10. Is it necessary to visit a dealership for repairs related to OBDII code C1115 on a 2014 GMC Sierra?

- While visiting a dealership or a qualified mechanic is advisable for accurate diagnosis and repair of OBDII code C1115, DIY enthusiasts with the necessary skills and tools may be able to address simpler issues themselves.

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