OBD-II code · Powertrain (generic)
P02CA Turbocharger/Supercharger B Overboost Condition
Boost pressure on the secondary turbocharger/supercharger (B) on a sequential or twin-charged setup is above the upper threshold. Wastegate stuck closed, VGT vanes stuck, or boost pressure sensor reads high.
Is it safe to drive with P02CA?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWastegate stuck closed
- PossibleVGT vanes stuck closed
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–8 h
- Emissions test
- Likely to fail
- Parts involved
- Turbocharger B, Wastegate B, Boost Pressure Sensor B
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.