[Opie55]

First, don't read too much into there not being a light on the dash. You can scan a car and find lots of stored error codes in different modules, none of which triggered a dash light. Second, there are some purely mechanical issues that won't trigger an error code. Third, don't assume it's a transmission or transfer case issue. Limp mode can be triggered by a number of things. Fourth, w/o actually being able to drive your car, it is not possible to guess what is going on.

Finally, I have no idea what "trusted" shop means because many posts like yours say that. Trusted usually means "where I've gone in the past" but is not necessarily synonymous with good. If it is not a shop that specializes in BMWs, find one that does.