50-47: Two Speed Error On
I notice in the troubleshooting flowchart that "Replace Drive Controller" appears a couple of times...amongst other stuff like "check wiring harness". More details can be found in the service manual...but since I presume you are under warranty I think I'd call the dealer. If possible, I'd leave it dead right where it sits and let them figure out how to load it.
do you happen to have a digital copy of the trouble shooting flow chart?