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C1118 Chevrolet Code - Trailer Brake Control Sensitivity Switch Circuit Malfunction

Quick Answer

The C1118 Chevrolet code indicates a malfunction in the trailer brake control sensitivity switch circuit. Common causes include Faulty trailer brake control sensitivity switch, Damaged wiring or connectors in the sensitivity switch circuit, Corrosion or moisture intrusion in the circuit components. 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 Chevrolet indicates Trailer Brake Control Sensitivity Switch Circuit Malfunction.
Common causes
Common causes include Faulty trailer brake control sensitivity switch, Damaged wiring or connectors in the sensitivity switch circuit, Corrosion or moisture intrusion in the circuit components.
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 10, 2024
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Code C1118 Chevrolet Description

The C1118 Chevrolet code indicates a malfunction in the trailer brake control sensitivity switch circuit. This component is responsible for adjusting the sensitivity of the trailer brakes based on various factors such as load weight and road conditions. When this circuit malfunctions, it can lead to issues with the trailer brake system's performance, potentially compromising the vehicle's ability to safely tow a trailer.

OBDII Code C1118 Chevrolet - Trailer Brake Control Sensitivity Switch Circuit Malfunction
C1118 Chevrolet Code - Trailer Brake Control Sensitivity Switch Circuit Malfunction

Common Causes of C1118 Chevrolet

  1. Faulty trailer brake control sensitivity switch
  2. Damaged wiring or connectors in the sensitivity switch circuit
  3. Corrosion or moisture intrusion in the circuit components
  4. Issues with the trailer brake control module or related sensors
  5. Electrical problems such as short circuits or open circuits in the circuit

Symptoms of C1118 Chevrolet

  1. Illumination of the trailer brake warning light on the dashboard
  2. Inconsistent or delayed response from the trailer brakes when applied
  3. Uneven braking performance between the vehicle and the trailer
  4. Increased stopping distance when towing a trailer
  5. Loss of trailer brake functionality altogether

How to Fix C1118 Chevrolet

  1. Begin by performing a thorough inspection of the sensitivity switch circuit, including the switch itself, wiring, connectors, and control module.
  2. Test the sensitivity switch for proper operation using a multimeter to check for continuity and resistance.
  3. Replace any faulty components such as the sensitivity switch, wiring harness, or control module as needed.
  4. Clear the diagnostic trouble codes from the vehicle's computer system using a scan tool.
  5. Test the trailer brake system to ensure that the issue has been resolved and that the brakes are functioning correctly.

Cost to Fix C1118 Chevrolet

The typical repair costs for addressing a C1118 Chevrolet code related to the trailer brake control sensitivity switch circuit malfunction can range from $200 to $500, including parts and labor. However, it is essential to note that the actual costs may vary depending on the specific diagnosis, replacement parts required, and labor rates at the auto repair shop. Additional factors such as the vehicle's make and model, as well as the location of the repair facility, can also impact the final cost. It is advisable to consult with a certified mechanic or repair shop to obtain a more accurate estimate based on the specific circumstances.

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Information for Specific Chevrolet Models

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 C1118 Chevrolet Code

1. What are the common symptoms of OBDII code C1118 in a Chevrolet related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- Common symptoms include the trailer brake system not functioning properly, warning lights on the dashboard, and potential issues with trailer braking responsiveness.

2. What are the possible causes of OBDII code C1118 in a Chevrolet indicating the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- Possible causes can include faulty trailer brake control modules, damaged wiring or connectors, sensor malfunctions, or issues with the sensitivity switch circuit itself.

3. How can I diagnose the Trailer Brake Control Sensitivity Switch Circuit Malfunction causing OBDII code C1118 in my Chevrolet?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble code, inspecting the trailer brake control system components, checking wiring integrity, and testing the sensitivity switch circuit.

4. Can I continue to drive my Chevrolet with OBDII code C1118 related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- It is not recommended to continue driving with this code present, as it can compromise the effectiveness of the trailer brake system, potentially leading to unsafe towing conditions.

5. How can I repair OBDII code C1118 in my Chevrolet due to the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- Repair options may include replacing the trailer brake control module, repairing or replacing damaged wiring, fixing sensor issues, or addressing any faults in the sensitivity switch circuit.

6. Are there any DIY tips for troubleshooting OBDII code C1118 related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction in a Chevrolet?

- DIY enthusiasts can start by checking for loose connections, inspecting the wiring for any visible damage, and ensuring proper functioning of the sensitivity switch before seeking professional help.

7. Can weather conditions or external factors trigger OBDII code C1118 in a Chevrolet indicating the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- While extreme weather conditions or exposure to water can potentially affect the trailer brake system, it is more likely that internal component failures or wiring issues are the primary culprits behind this code.

8. Is it necessary to reset the OBDII system after repairing OBDII code C1118 related to the Trailer Brake Control Sensitivity Switch Circuit Malfunction in a Chevrolet?

- Yes, it is recommended to clear the trouble code and reset the OBDII system after completing repairs to ensure the system recognizes the issue has been resolved.

9. How can I prevent OBDII code C1118 from reoccurring in my Chevrolet after repairing the Trailer Brake Control Sensitivity Switch Circuit Malfunction?

- Regular maintenance checks, proper installation of trailer brake components, and prompt troubleshooting of any issues can help prevent the reoccurrence of this code in the future.

10. Will fixing OBDII code C1118 in a Chevrolet due to the Trailer Brake Control Sensitivity Switch Circuit Malfunction require specialized tools or equipment?

- While basic diagnostic tools are essential, specialized equipment may be needed for in-depth troubleshooting or reprogramming tasks, making professional assistance advisable for complex repairs.

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