BMW TSB #B260422
2020 BMW M340i
Affected Component: POWER TRAIN
- Summary
- There is a howling or whistling noise from under the vehicle at 30 -37 mph (50 -60 km/h) when driving after a cold start, when the outside temperature is 32 F (0 C) or lower. The noise goes away as the vehicle/driveline reaches operating temperature.