2017 Volt stuck on 'initializing, wait to shift' message

Hi everyone.
I have a 2017 volt with no previous issues but the 12-volt battery was run down last night because of the emergency lights accidentally being left on for hours. I got a boost and drove home and this morning the car is giving me the 'initializing, wait to shift message' but never lets me shift. The electric motor battery isn't charged up but the car has gas in it. I'm in a remote city where the GM dealer appears to know little about electric cars and also doesn't have a service opening for at least 2 weeks. Does anyone have any insight on what exactly the problem is or a general phone number I can call to talk to a technician and get enough information such that an independent dealer might be able to fix it?
Thanks