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.
Affected components
- Brake booster
- Boost sensor
- Brake control module
Common causes
- High likelihood: Boost sensor failed
- Medium likelihood: Sensor wiring or connector fault
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.