OBD-II code · Chassis
C057E Brake Booster Temperature Sensor A/B Correlation
Brake booster temperature sensors A and B disagree beyond plausible deviation. 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 C057E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor drifted
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 Sensors
Related codes
- C057BBrake Booster Temperature Sensor B Circuit/Open
- C057CBrake Booster Temperature Sensor B Circuit Range/Performance
- C057DBrake Booster Temperature Sensor Circuit B Intermittent/Erratic
- C057FBrake Booster Motor A Phase U-V-W Circuit/Open
- C0580Brake Booster Motor A Phase U-V-W Circuit Low
- C0581Park Brake Apply Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.