[nahtes.-]

I was previously having a problem with a wastegate rattle noise on my 2022 BMW M340i and now all of a sudden, the noise is gone and the car will not produce any boost at all or even spool the turbo. The car has not thrown any engine codes aside from "21B25F Voltage atKL40: Under voltage comparator activated." There is no check engine light either. The car is not tuned (to my knowledge as the dealer i bought it from said it was not). It drives fine (aside from being slow asf) and can still get me A-B but its not what I'm paying for. The car has an aftermarket BMS Intake with stock turbo inlet. The car has 61k miles and no dealer warranty.

[G20Debug]

I had the exact same issue after installing the bms intake (no box). You and I must have installed it wrong because tons of users here run it with no issues. I removed it and reinstalled the stock box, problem solved. 2022 m340i

[nahtes.-]

Originally Posted by G20Debug

I had the exact same issue after installing the bms intake (no box). You and I must have installed it wrong because tons of users here run it with no issues. I removed it and reinstalled the stock box, problem solved. 2022 m340i

The concern here is, I bought the car with the BMS intake on and drove it 500 miles before this issue arose. I also removed the intake earlier today and re-installed it and still having the same issue. I also do not have stock intake to re-install

[g20jomi]

did you ever sort this out?

[B58Vic]

Yea any updates?