Hi, this could be your battery loosing voltage, check it with a volt meter to see if it reads between 12v - 12.5 v if it is low it might need replacing, you could also check your alternator to see if it is charging correctly you will find your car will be stuck in either 3rd or 4th gear ( limp home mode ) hope this helps please vote thanks
Where to check your transmission fluid it is a bmw 2006 750li
SOURCE: my 2006 bmw 750li is showing transmission fault
Try changing Trans oil and filter..if this dont help...Tranny time GL
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