Turbocharger Compressor Outlet Valve Stuck Open
Compressor outlet valve mechanically stuck open — boost pressure leaks back to intake before reaching the cylinders, causing under-boost.
Affected components
- Diverter valve
Common causes
- High likelihood: Diaphragm torn or seat eroded
- Low likelihood: Carbon or debris buildup preventing free movement
- Low likelihood: Component wear with age - mechanical play
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
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.