P0703
Brake Switch B Circuit
P0703 is an OBD-II diagnostic trouble code meaning: Brake Switch B Circuit. Common causes: faulty brake light switch, open or short circuit in wiring. Estimated repair cost: $9–33.
Symptoms
- Cruise control doesn't work
- Problems with gear shifting (on cars with automatic transmission)
- Check Engine Light Is On
- Brake lights may not work correctly
- The engine does not start (in some cases)
Causes
- Faulty brake light switch
- Open or short circuit in wiring
- Poor contact in connectors
- Problems with the transmission control module
- Corrosion of switch contacts
How to Fix
- Check the operation of the brake lights
- Inspect the wiring and connectors of the switch
- Check the resistance of the brake light switch
- If necessary, replace the switch
- Reset the error code and check if it returns
Related codes
Error P0703 by Vehicle Brand
FAQ
What does the P0703 code mean?
P0703 is an OBD-II diagnostic trouble code that indicates: Brake Switch B Circuit
What causes a P0703 error code?
The most common causes of P0703 include: Faulty brake light switch; Open or short circuit in wiring; Poor contact in connectors; Problems with the transmission control module.
How do I fix a P0703 diagnostic trouble code?
To fix P0703: Check the operation of the brake lights. Inspect the wiring and connectors of the switch. Check the resistance of the brake light switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0703?
Limited driving only, diagnose soon
How much does it cost to fix P0703?
The estimated repair cost for P0703 is $9–33. Actual cost depends on your vehicle, location, and labor rates.
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