Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance
The boost pressure A signal stays within electrical limits but does not match expected values for the current operating point. Typical causes are leaking charge piping, a stuck wastegate, or sensor drift.
Affected components
- Boost pressure sensor
- Charge air piping
- Wastegate
Common causes
- High likelihood: Charge air piping leaking
- Medium likelihood: Wastegate stuck or seized
- Low likelihood: Sensor drift
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.