OBD-II code · Chassis
C0279 Brake Booster Boost Sensor Circuit Malfunction
The brake control module has detected an electrical fault in the booster boost (assist pressure) sensor circuit. Power-assist regulation may default to a backup strategy.
Is it safe to drive with C0279?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBoost sensor failed
- PossibleSensor wiring or connector fault
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
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Booster, Boost Sensor, Brake Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.