If you want to check for low transmission fluid the fill hole on the side of the transmission is the place. When full fluid is supposed to barely run out when you remove the plug. That said, unless you have been seeing fluid dripping when parked or obviously on the undercarriage it is not likely a low fluid issue. If you are CLOSE to a dealer or preferably a BMW indy shop you can take a chance and drive it there with transmission in manual in one gear. The highest you can go is 3rd as the transmission will down shift on it's own. HOWEVER, best and only safe route is to call the local towing company, especially if you have not checked for low fluid. It is hard to troubleshoot transmission problems. We can give you are experiences of what was wrong when that happened but it may not be the problem you are having.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas