Chassis
generic / SAE
C0571
Active Brake Assist Performance
The brake assist or driver assistance module has detected that brake assist performance is degraded. The system may fail to autonomously build pressure during emergency braking and emergency brake assist functions are limited.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / 71
Possible causes
- Active booster slow or weak high
- Secondary fault on related sensor medium
- System calibration required after repair low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2500 €
- Estimated time: 1–5 h
- Component: active brake booster
- Component: brake assist module
- Component: brake pressure sensor
Sources
References
sae:J2012