Hello
I had the same problem!
Had the car checked by several BMW partners and finally got the correct answer from BMW Frankfurt!
None of the 3 BMW Partners could give the correct explanation.
According to the gear box specialist of BMW Frankfurt it is normal. The noise is actually caused by the hydraulic pressure valve. Thus preventing the gear box switching in to P as it would normally do when the car is switched off.
This noise is typical to M cars having this type DCT.
Cheers
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