Brake Booster Pressure Sensor Circuit
A general circuit fault is detected on the brake booster pressure sensor - the ECU cannot determine vacuum reserve in the booster, which limits the safe operation of stop-start, regenerative-braking blending, and electric vacuum pump control.
Affected components
- Brake booster pressure sensor
Common causes
- High likelihood: Open in sensor or wiring
Possible symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.