Turbo/Super Charger Boost System Performance
Boost pressure does not match the requested target during normal operation. The deviation between commanded and measured boost exceeds the calibrated tolerance, often due to leaks, sticking actuators or sensor errors.
Affected components
- Turbocharger
- Boost pressure sensor
- Vnt actuator
- Charge air pipe
Common causes
- High likelihood: Charge-air leak
- High likelihood: VNT vanes sticking with soot
- Medium likelihood: Boost pressure 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
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
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.