Chassis
generic / SAE
C004C
Brake Booster Motor A Position Sensor Exceeded Learning Limit
Brake booster motor A position sensor learned offset exceeded the allowed range. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number– / 4C
Possible causes
- Calibration not performed after replacement high
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: booster motor a pos sensor
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012