Powertrain
generic / SAE
P2CB8
Turbocharger/Supercharger Boost Pressure B Too High – Mechanical
The boost pressure on branch B exceeds the calibrated maximum. Mechanical fault — wastegate stuck closed or boost control valve jammed.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberC / B8
Possible causes
- Wastegate stuck closed high
- Boost control valve jammed 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: 400–4000 €
- Estimated time: 2–12 h
- Component: turbocharger b
- Component: wastegate b
- Component: boost pressure sensor b
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012