Powertrain
generic / SAE
P02CB
Turbocharger/Supercharger B Underboost Condition
Boost pressure on the secondary turbocharger/supercharger (B) is below the lower threshold. Wastegate stuck open, charge-air leak, or VGT vanes stuck open.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number2 / CB
Possible causes
- Wastegate stuck open high
- Charge-air pipe leak medium
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: hard
- DIY: shop recommended
- Estimated cost: 150–2500 €
- Estimated time: 1–6 h
- Component: turbocharger b
- Component: wastegate b
- Component: charge air pipe
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012