OBD-II code · Chassis
C057D Brake Booster Temperature Sensor Circuit B Intermittent/Erratic
Intermittent signal from brake booster temp sensor B. 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 C057D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector loose
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- 0.5–3 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
- C057ABrake Booster Temperature Sensor B Circuit High
- C057BBrake Booster Temperature Sensor B Circuit/Open
- C057CBrake Booster Temperature Sensor B Circuit Range/Performance
- C057EBrake Booster Temperature Sensor A/B Correlation
- C057FBrake Booster Motor A Phase U-V-W Circuit/Open
- C0580Brake Booster Motor A Phase U-V-W Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.