OBD-II code · Chassis
C05B5 Brake Booster Temperature Sensor C Circuit/Open
Open circuit on brake booster temperature sensor C. 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 C05B5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire open
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- Parts involved
- Brake Booster Temp Sensor C
Related codes
- C057BBrake Booster Temperature Sensor B Circuit/Open
- C05B2Steering Wheel Angle Sensor Signal - Yaw Rate Sensor Signal Correlation
- C05B3Brake Booster Temperature Sensor C Circuit Low
- C05B4Brake Booster Temperature Sensor C Circuit High
- C05B6Brake Booster Temperature Sensor C Circuit Range/Performance
- C05B7Brake Booster Temperature Sensor C Circuit Intermittent/Erratic
- C05B8Brake Booster Motor A Position Sensor Supply Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.