C1115:08 Code - Manual Trailer Brake Apply Request Switch Signal Invalid
Quick Answer
The C1115:08 diagnostic trouble code (DTC) indicates that the manual trailer brake apply request switch signal is invalid. Common causes include Faulty manual trailer brake apply request switch, Damaged wiring harness connecting the switch to the electronic control module, Malfunctioning electronic 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
- C1115:08 indicates Manual Trailer Brake Apply Request Switch Signal Invalid.
- Common causes
- Common causes include Faulty manual trailer brake apply request switch, Damaged wiring harness connecting the switch to the electronic control module, Malfunctioning electronic 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.
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Code C1115:08 Description
The C1115:08 diagnostic trouble code (DTC) indicates that the manual trailer brake apply request switch signal is invalid. This means that the signal from the manual trailer brake apply request switch is not being received or is not functioning properly. The manual trailer brake apply request switch is a component that allows the driver to manually apply the brakes on a trailer being towed by the vehicle. When this signal is invalid, it can affect the vehicle's ability to control the trailer's braking system, potentially leading to unsafe driving conditions.
Common Causes of C1115:08
- Faulty manual trailer brake apply request switch
- Damaged wiring harness connecting the switch to the electronic control module
- Malfunctioning electronic control module
- Corrosion or poor connections in the electrical system
- Water damage or exposure to the elements affecting the switch or wiring
Symptoms of C1115:08
- Erratic trailer braking behavior
- Reduced braking effectiveness when towing a trailer
- Inability to manually apply trailer brakes
- Warning light on the dashboard related to trailer brake system
How to Fix C1115:08
- Begin by inspecting the manual trailer brake apply request switch for any visible damage or signs of malfunction. Replace the switch if necessary.
- Check the wiring harness for any breaks, fraying, or corrosion. Repair or replace the wiring as needed.
- Test the electronic control module to ensure it is functioning properly. Replace the module if it is found to be faulty.
- Clear the DTC from the vehicle's onboard computer using a diagnostic scan tool.
- Test the trailer brake system to ensure proper functionality and calibration after the repair is completed.
Cost to Fix C1115:08
The typical repair costs for addressing the C1115:08 DTC can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing the manual trailer brake apply request switch can cost between $50 to $150, while repairing or replacing the wiring harness may range from $100 to $300. If the electronic control module needs to be replaced, the cost can be higher, ranging from $200 to $500 or more. Labor costs can add to the total repair bill, with rates typically ranging from $80 to $150 per hour. It's advisable to consult with a professional mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.
Tech Notes for C1115:08
C1115:5A Manual Trailer Brake Apply Request Switch Signal Plausibility Failure
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