C1A4B
Stop Light Relay Circuit
C1A4B is an OBD-II diagnostic trouble code meaning: Stop Light Relay Circuit. Common causes: faulty brake light relay, open or short circuit in wiring harness. Estimated repair cost: $11–56.
Symptoms
- Brake lights don't work
- The malfunction indicator on the dashboard is on
- Error C1A4B in the control unit memory
Causes
- Faulty brake light relay
- Open or short circuit in wiring harness
- Problems with contacts in the circuit
- Control unit malfunction
How to Fix
- Check the operation of the brake lights
- Check brake light relay
- Inspect the wiring harness for damage
- Check the contacts in the circuit
- If necessary, replace the relay or repair the wiring
Related codes
FAQ
What does the C1A4B code mean?
C1A4B is an OBD-II diagnostic trouble code that indicates: Stop Light Relay Circuit
What causes a C1A4B error code?
The most common causes of C1A4B include: Faulty brake light relay; Open or short circuit in wiring harness; Problems with contacts in the circuit; Control unit malfunction.
How do I fix a C1A4B diagnostic trouble code?
To fix C1A4B: Check the operation of the brake lights. Check brake light relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1A4B?
Limited driving only, diagnose soon
How much does it cost to fix C1A4B?
The estimated repair cost for C1A4B is $11–56. Actual cost depends on your vehicle, location, and labor rates.
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