P2CB6
Turbocharger/Supercharger Boost System Performance
The turbocharger/supercharger boost system on the B branch does not deliver the expected boost pressure. Multiple components possible.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Common causes
Ordered by how often each turns out to be the cause.
- Wastegate calibration driftedCommon
- Leak in charge air pathPossible
Parts involved
- Turbocharger B
- Wastegate B
- Boost Pressure Sensor B
P2CB6 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.