I had the same problem with my 2012 X6. Three weeks after getting the care the error popped up. Dealer called it a glitch. The fault code would clear out once you let the car "sleep". To make a long story short (3 more visits later) the tech had to consult with BMW engineers and was told to replace the TRANSFER CASE.
I got my car back last friday, no issues overt there weekend.
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