P22C9 — Turbocharger Compressor Outlet Valve Stuck Closed
Compressor outlet valve mechanically stuck closed — pressure cannot be released on throttle close, causing audible compressor surge ("flutter") and stress on the turbo bearings.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Diverter valve
- Turbocharger
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Valve seized
- Carbon or debris buildup preventing free movement
- 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
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
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.