Master Cylinder Pressure Sensor Range/Performance
The ABS or stability control module has detected an implausible signal from the master cylinder brake pressure sensor. This sensor reports driver brake input and is used by ABS and ESP for control decisions.
Affected components
- Master cylinder pressure sensor
- Abs control module
- Esp control module
Common causes
- High likelihood: Pressure sensor failed
- Medium likelihood: Wiring or connector fault
- Low likelihood: Air in brake system causing erratic pressure
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.