C05CD
Brake Master Cylinder Piston Position Sensor B Circuit Voltage High
Brake master cylinder piston position sensor B signal voltage above expected range.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to batteryCommon
Parts involved
- Master Cylinder Pos Sensor B
C05CD is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.