OBD-II code · Powertrain (generic)
P0046 Turbocharger/Supercharger Boost Control A Circuit Range/Performance
Boost control actuator A is electrically active but boost pressure deviates from target. Mechanical or hydraulic limitation.
Is it safe to drive with P0046?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyVacuum/boost line leak
- PossibleWastegate sticking
- Less likelySensor element aged beyond calibration window
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Boost Control Solenoid, Wastegate, Vacuum Lines
Related codes
- P004BTurbocharger/Supercharger Boost Control B Circuit Range/Performance
- P0043HO2S Heater Control Circuit Low Bank 1 Sensor 3
- P0044HO2S Heater Control Circuit High Bank 1 Sensor 3
- P0045Turbocharger/Supercharger Boost Control A Circuit/Open
- P0047Turbocharger/Supercharger Boost Control A Circuit Low
- P0048Turbocharger/Supercharger Boost Control A Circuit High
- P0049Turbocharger/Supercharger A Turbine Overspeed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.