OBD-II code · Powertrain (generic)
P0049 Turbocharger/Supercharger A Turbine Overspeed
The turbocharger A turbine speed exceeded its safe limit. Risk of bearing damage and shaft fracture. Often caused by a stuck-closed wastegate or boost control fault.
Is it safe to drive with P0049?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWastegate stuck closed
- PossibleBoost control loop fault
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
- 2–10 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Turbocharger, Wastegate, Turbine Speed Sensor
Related codes
- P00C5Turbocharger/Supercharger B Turbine Overspeed
- P0046Turbocharger/Supercharger Boost Control A Circuit Range/Performance
- P0047Turbocharger/Supercharger Boost Control A Circuit Low
- P0048Turbocharger/Supercharger Boost Control A Circuit High
- P004ATurbocharger/Supercharger Boost Control B Circuit/Open
- P004BTurbocharger/Supercharger Boost Control B Circuit Range/Performance
- P004CTurbocharger/Supercharger Boost Control B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.