OBD-II code · Chassis
C05D2 Master Cylinder Piston Position Higher Than Expected
Master cylinder piston position higher than expected — typically too much pedal travel for the commanded brake pressure.
Is it safe to drive with C05D2?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAir in brake system or fluid leak
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Master Cylinder
Related codes
- C05CFBrake Master Cylinder Piston Position Sensor B Circuit Range/Performance
- C05D0Brake Master Cylinder Piston Position Sensor A/B Correlation
- C05D1Brake Master Cylinder Piston Position Sensor Supply Circuit
- C05D3Driver Applied Pressure Higher Than Expected
- C05D4Brake Master Cylinder Piston Position Sensor Calibration Not Learned
- C05D5Brake Master Cylinder Cut Off Valve
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.