Turbocharger/Supercharger Boost Sensor "A" Circuit Low
The boost pressure A signal voltage is below the lower diagnostic threshold — open circuit, short to ground, or sensor element failure.
Affected components
- Boost pressure sensor
- Boost sensor wiring
Common causes
- High likelihood: Sensor circuit shorted to ground or open
- Medium likelihood: Boost pressure sensor failed
- Low likelihood: Connector pins corroded - high contact resistance
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
- This code can affect emissions
- Reduced-power or limp mode may occur
Related codes
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.