Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / C8
Possible causes
- Diaphragm torn or seat eroded high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: diverter valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012