Chassis
generic / SAE
C05CC
Brake Master Cylinder Piston Position Sensor A Circuit Range/Performance
Master cylinder piston position sensor A reading implausible. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / CC
Possible causes
- Sensor reading drifted high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping 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: 200–1500 €
- Estimated time: 1–5 h
- Component: master cylinder pos sensor a
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012