OBD-II code · Powertrain (generic)
P0249 Turbocharger/Supercharger Wastegate Actuator B Low
Wastegate actuator B control voltage below expected range. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Is it safe to drive with P0249?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring shorted to ground
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
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Wastegate Actuator B, Actuator Wiring
Related codes
- P0246Turbocharger/Supercharger Wastegate Solenoid "A" High
- P0247Turbocharger Wastegate Solenoid B Low
- P0248Turbocharger Wastegate Solenoid B High
- P024ACharge Air Cooler Bypass Control A Range/Performance
- P024BCharge Air Cooler Bypass Control A Stuck
- P024CCharge Air Cooler Bypass Position Sensor A Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.