OBD-II code · Chassis
C057C Brake Booster Temperature Sensor B Circuit Range/Performance
Brake booster temperature sensor B 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 C057C?
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 B
Related codes
- C05B6Brake Booster Temperature Sensor C Circuit Range/Performance
- P25C5Brake Booster Temperature Sensor A Circuit Range/Performance
- C0579Brake Booster Temperature Sensor B Circuit Low
- C057ABrake Booster Temperature Sensor B Circuit High
- C057BBrake Booster Temperature Sensor B Circuit/Open
- C057DBrake Booster Temperature Sensor Circuit B Intermittent/Erratic
- C057EBrake Booster Temperature Sensor A/B Correlation
- C057FBrake Booster Motor A Phase U-V-W Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.