OBD-II code · Powertrain (generic, extended)
P22C8 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.
Is it safe to drive with P22C8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDiaphragm torn or seat eroded
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Diverter Valve
Related codes
- P22C5Turbocharger Compressor Outlet Valve Control Circuit/Open
- P22C6Turbocharger Compressor Outlet Valve Control Circuit Low
- P22C7Turbocharger Compressor Outlet Valve Control Circuit High
- P22C9Turbocharger Compressor Outlet Valve Stuck Closed
- P22CATurbocharger Compressor Outlet Switching Valve Control Circuit/Open
- P22CBTurbocharger Compressor Outlet Switching Valve Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.