P0571moderate severityPowertrain
Cruise Control/Brake Switch A Circuit Malfunction
on 2011 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
The PCM has detected a fault in the brake switch circuit used by the cruise control system. This can cause the cruise control to malfunction or fail to disengage on braking.
Symptoms
- Cruise won't cancel when braking
- Brake lights malfunction
- Cruise control inoperative
Common causes
- Faulty brake light switch
- Misadjusted brake switch
- Wiring or connector fault
- PCM fault
Diagnostic steps
- Test brake switch operation
- Check switch adjustment
- Inspect wiring and connectors
- Replace brake switch as needed
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