P0571 Code: Brake Switch A Circuit Malfunction
🟠 Moderate severity · drivable
Drivable, but the brake lights or cruise control may not work correctly, which is a safety concern.
What P0571 means
The brake pedal switch (switch A) circuit has an electrical fault. This switch tells the computer when the brakes are applied, and it also controls the brake lights and disengages cruise control.
Symptoms
- Check engine light is on
- Cruise control not working
- Brake lights not working or staying on
- Shift-interlock or push-to-start issues
Common causes
- most common: Faulty brake light switch
- common: Damaged wiring or loose connector
- less common: Misadjusted brake switch
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the brake light switch | Yes | $20–80 |
| Adjust or repair the brake switch wiring | Yes | $10–50 |
Frequently asked questions
Can I drive with a P0571 code?
Yes, but your brake lights may not work correctly, which is a safety risk. Fix it soon.
What is the most common cause of P0571?
A faulty brake light switch. It's an inexpensive, easy-to-replace part.
How much does it cost to fix a P0571?
Typically $20–$80 for a new brake light switch.
Related codes
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.