OBD-II code · Chassis
C05C2 Brake Booster Motor A Over Temperature
Brake booster motor A exceeded its safe operating temperature. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Is it safe to drive with C05C2?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyThermal overload from extended braking
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Brake Booster Motor A
Related codes
- C05BFBrake Booster Motor B Position Sensor Supply Circuit Range/Performance
- C05C0Brake Pedal Position Sensor A Not Learned
- C05C1Brake Pedal Position Sensor B Not Learned
- C05C3Brake Booster Motor A Supply Circuit
- C05C4Brake Pressure Sensor F Missing Calibration
- C05C5Brake Pressure Sensor F Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.