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Before reading my answer below, please note that I do not receive any credit or compensation whatsoever for my time and effort until the green ACCEPT button is pressed. Thank you.

Hello and welcome to JustAnswer BMW,

My name is XXXXX XXXXX it will be my pleasure to assist you today.

this would usually indicate an issue with the smg control unit or possibly the temp sensor if it is not being replaced, not the transmission itself. although, a temp sensor problem should log a conclusive fault

the software should be updated if it has not, then smg control unit replacement would be next

you might consider asking the dealer to invovle their regional technical representative from bmw head office if they are stumped, I have seen these guys solve issues like this time and time again that have been stumping dealers for weeks.

I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.

Best wishes to you on your repair.

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thank you in advance.

Steve