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Hi all - been having this issue of the DTM alert popping up at random times since Dec 2015. Since then, any time the car would be over 30MPH and I would let my foot off the gas, I would hear this humming sound coming from the engine. Once it goes under 30MPH, the sound is gone. This sound is there every time I drive the car.
However, I did notice that one time when I floored the car from a red light, the DTM came on right away.
I brought my car to the dealership today to get it annually inspected but also to check the issue. Costing me $180 to just diagnosis the problem. The SA let me know that since my car is out of warranty but has very low miles, they potentially can do a make-good repair if is wrong without costing me an arm and leg.
My car: 2011 535i xDrive (Sport, not M-Sport); 30k miles.
Let me know if anyone else is experiencing this humming issue and I will keep everyone posted on what my SA says.
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