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P0571: Brake Switch "A" Circuit
Severity: Low Usually safe to keep driving, but get it checked.
What does P0571 mean?
The engine computer has seen an implausible or missing signal from the brake pedal switch. Some sources list it under its older name, Cruise Control/Brake Switch A Circuit, because cruise control uses this signal to cancel when you brake.
Generic OBD-II definition: Brake Switch "A" Circuit. Confirm applicability in your vehicle service information.
Common causes
- Faulty brake light switch
- Misadjusted switch
- Wiring issue
Symptoms
- Cruise control not working
- Brake lights on or off incorrectly
Can I keep driving with P0571?
Severity: Low Usually safe to keep driving, but get it checked.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Check brake lights
- Adjust or replace switch