Powertrain
generic / SAE
P22CD
Turbocharger Compressor Outlet Switching Valve Stuck Open
Compressor outlet switching valve mechanically stuck open — sequential boost cannot transition stages cleanly.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / CD
Possible causes
- Valve stuck open 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: shop recommended
- Estimated cost: 120–800 €
- Estimated time: 0.7–3 h
- Component: boost switching valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012