I have a 2016 gts. Was driving to a restaurant a couple of nights ago when I got the message "electronic rear axle currently not available". I pulled over and shut car off. When I tried to restart, nothing. And it was stuck in park. Had a flatbed bring it to local Mercedes dealer. They called the factory in Germany, and the factory said they were sending a brand new transmission. The local dealer was surprised by how quickly the factory offered to do this without even suggesting other "fixes". Almost like this was something they've encountered before. Car has only 2,000 miles and is pampered.