Powertrain
generic / SAE
P0571
Brake Switch "A" Circuit Malfunction
The brake light switch signal seen by the ECU is implausible — for example, both contacts active simultaneously, or no signal change despite the brake pedal being pressed (cruise control engages and disengages on this signal). On many cars also disables shift interlock.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 71
Possible causes
- Brake switch failed (worn contacts, internal break) high
- Switch misadjusted (does not actuate at correct pedal position) medium
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 20–150 €
- Estimated time: 0.2–1 h
- Component: brake light switch
- Component: brake light switch wiring
- MIL / check engine light
Sources
References
sae:J2012