Chassis
generic / SAE
C0277
Brake Booster Vacuum Sensor Circuit Malfunction
The brake control module has detected an implausible signal from the booster vacuum sensor. Loss of vacuum signal can cause hard pedal and reduced power assist.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number2 / 77
Possible causes
- Vacuum sensor failed high
- Vacuum leak in booster or hose medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: brake booster
- Component: vacuum sensor
- Component: brake control module
Sources
References
sae:J2012