Brake Vacuum Sensor
The brake control module has detected an implausible signal from the vacuum sensor on the brake booster. Modern systems monitor booster vacuum to ensure brake assist is available, especially with stop-start engines and electric vacuum pumps.
Affected components
- Brake vacuum sensor
- Brake booster
- Vacuum pump
Common causes
- High likelihood: Vacuum sensor failed
- Medium likelihood: Leak in vacuum supply line
- Low likelihood: Vacuum pump weak
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.