C1118
Trailer Brake Control Sensitivity Switch Circuit Malfunction
C1118 is an OBD-II diagnostic trouble code meaning: Trailer Brake Control Sensitivity Switch Circuit Malfunction. Common causes: open or short circuit in wiring harness, oxidation of switch contacts. Estimated repair cost: $56–167.
Symptoms
- Trailer brake sensitivity switch not working
- Unstable trailer braking
- Malfunction indicator light comes on
Causes
- Open or short circuit in wiring harness
- Oxidation of switch contacts
- Sensitivity switch malfunction
- Problems with the trailer brake control unit
How to Fix
- Check the integrity of the wiring harness
- Clean switch contacts
- Test sensitivity switch
- Replace switch if necessary
- Check the operation of the trailer brake control unit
Related codes
FAQ
What does the C1118 code mean?
C1118 is an OBD-II diagnostic trouble code that indicates: Trailer Brake Control Sensitivity Switch Circuit Malfunction
What causes a C1118 error code?
The most common causes of C1118 include: Open or short circuit in wiring harness; Oxidation of switch contacts; Sensitivity switch malfunction; Problems with the trailer brake control unit.
How do I fix a C1118 diagnostic trouble code?
To fix C1118: Check the integrity of the wiring harness. Clean switch contacts. Test sensitivity switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1118?
Limited driving only, diagnose soon
How much does it cost to fix C1118?
The estimated repair cost for C1118 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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