Brake Booster Vacuum Sensor Circuit
The brake booster vacuum sensor reports an implausible signal; brake assist functions are reduced. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Affected components
- Brake booster vacuum sensor
- Vacuum hose
Common causes
- High likelihood: Vacuum hose leak
- Medium likelihood: Sensor failed
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.