Turbocharger/Supercharger A Boost Pressure Too High - Mechanical
Boost pressure on turbo A exceeds the upper threshold and the cause is mechanical (wastegate stuck closed, VGT vanes stuck closed) rather than electrical drive fault.
Affected components
- Turbocharger
- Wastegate
Common causes
- High likelihood: Wastegate or VGT stuck closed
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
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.