P0245 on BMW: How to Diagnose & Fix
Turbocharger/Supercharger Wastegate Solenoid "A" Circuit Low
3 BMW models · 3 documented issues · $100-$8,000 repair
P0245 on BMW by model: symptoms, diagnosis and fix
The wastegate actuator and boost solenoid can fail, causing boost control issues, over-boost conditions, or under-boost faults.
Common Symptoms
- Check engine light with boost codes
- Limp mode/reduced power
- Inconsistent boost
- Over-boost situations
How to Fix
Diagnose boost system for proper operation. Replace wastegate actuator or boost solenoid as needed. Check vacuum lines for leaks.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW pressure converter / boost-control solenoid 11747649407OEM11747649407
Fitment: N55 BMW 335i/335i xDrive applications using the pneumatic-wastegate pressure-converter system; verify VIN, build date, turbo/wastegate type, and failed component before ordering..
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
The B58 engine's electronic wastegate actuator can develop play over time, producing a characteristic rattling or buzzing noise at idle and during deceleration. The wastegate flapper valve develops clearance within its housing, causing it to vibrate at certain RPMs. While often described as just an annoyance, a severely worn wastegate can lead to boost control issues, over-boost or under-boost conditions, and eventually check engine lights for boost deviation faults.
Common Symptoms
- Rattling or buzzing noise at idle from turbocharger area
- Metallic vibration sound during deceleration
- Check engine light with boost control codes (advanced cases)
- Intermittent boost fluctuations at steady throttle
- Noise more pronounced in cold weather
How to Fix
Have the wastegate actuator inspected for excessive play. Minor rattle without fault codes can be monitored. If boost control faults develop, replace the turbocharger wastegate actuator. In severe cases, the entire turbocharger assembly may need replacement. BMW may cover under warranty if fault codes are present.
Sources for this issue (2)
N63 4.4L twin-turbo V8 engines in E71/F16 X6 xDrive50i (2008-2018) suffer from wastegate rattle and eventual turbocharger failure. The wastegate flapper jiggles within its mounting points against the turbo housing due to worn bushings, most noticeable at idle or when letting off throttle. This progresses to wastegate actuator failure, loss of boost, and eventually complete turbo failure requiring replacement of both turbos ($4,000-8,000). Garrett MGT2256S turbochargers are used in this application. Flapper repair kits are available for $50-100 per turbo as a more affordable intermediate fix. MAMBA adjustable actuator kits ($150-300) offer a more permanent solution. This compounds the N63 timing chain issue - 2008-2014 models have BOTH catastrophic timing chain AND wastegate/turbo failures.
Common Symptoms
- Rattling noise from engine bay at idle or low throttle (wastegate flutter)
- Loss of power and turbo lag
- Whistling or whining sounds from turbos
- Check engine light with boost pressure codes (P0234, 30FF)
- Reduced power mode or limp mode
- Oil leaking from turbo seals (failed turbo)
How to Fix
Repair options range from flapper repair kits ($50-100/turbo) to complete turbocharger replacement ($4,000-8,000 for both). Garrett MGT2256S flapper repair kit ($50-100 per turbo) is cheapest fix. MAMBA adjustable actuator kit ($150-300) provides more durable solution. OEM actuators 11657646093 available from BMW. Complete turbo replacement $2,000-4,000 per turbo. MONITORING: Wastegate rattle is early warning - address before complete turbo failure to avoid $8,000+ repair.
Sources for this issue (1)
P0245 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0245 mean on a BMW?
P0245 stands for "Turbocharger/Supercharger Wastegate Solenoid "A" Circuit Low." This code sets when the engine control module sees an abnormally low voltage (a short to ground or open) on the control circuit for turbocharger/supercharger wastegate solenoid "A." The wastegate solenoid regulates boost pressure by controlling the wastegate that bleeds off exhaust pressure. When the circuit reads low, the computer can no longer trust its control of boost, which can affect power and emissions. On BMW it is documented across 3 models: 3 Series, M340i, X6.
What are the most common causes of P0245?
The most common causes of P0245 are: Faulty wastegate solenoid (internally shorted), Wiring shorted to ground in the solenoid circuit, Corroded or loose solenoid connector, Open or damaged control wiring, Failed PCM/ECM driver circuit (less common), Vacuum/boost line issues affecting the solenoid. The specific cause varies by vehicle.
How much does it cost to fix P0245 on a BMW?
Published repair estimates on BMW range from $100 to $8,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.