2006 clk bmw not shifting gear doesn't pass 30 mph

Have the transmission fluid checked. ASAP. Also have the codes read, there may be something amiss with the computer to the transmission shifter. Is this a constant issue or was it just once?

Just start happening 2 weeks ago

This acts according to your information, as the transmission being low on transmission fluid. If not and the computers are good, than it just may be an internal issue with the transmission. Go to a local AAMCO for an assessment of the problem. Get a couple of opinions before tearing into a major money costing endeavor.

Thanks

Let us know what happens and what the issue was. It helps many people to learn this.