Code result
P2CB8
Turbocharger/Supercharger Boost Pressure B Too High – Mechanical
High severity
What it means
The boost pressure on branch B exceeds the calibrated maximum. Mechanical fault — wastegate stuck closed or boost control valve jammed.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Wastegate stuck closed
highOne of the most commonly reported causes for this code — check this first.
Boost control valve jammed
mediumA plausible cause — test and verify before replacing parts.
Related help
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