OBD-II code · Chassis
C05B6 Brake Booster Temperature Sensor C Circuit Range/Performance
Brake booster temperature sensor C reading implausible. 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 C05B6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor reading drifted
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
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
- 1–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Brake Booster Temp Sensor C
Related codes
- C057CBrake Booster Temperature Sensor B Circuit Range/Performance
- P25C5Brake Booster Temperature Sensor A Circuit Range/Performance
- C05B3Brake Booster Temperature Sensor C Circuit Low
- C05B4Brake Booster Temperature Sensor C Circuit High
- C05B5Brake Booster Temperature Sensor C Circuit/Open
- C05B7Brake Booster Temperature Sensor C Circuit Intermittent/Erratic
- C05B8Brake Booster Motor A Position Sensor Supply Circuit/Open
- C05B9Brake Booster Motor A Position Sensor Supply Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.