12volt

Hello, looking for some help here. Wife was driving the car a couple days ago in below 0 F temps when a series of warning indicators flashed. "CRITICAL FAILURE DETECTED, STOP DRIVING WHEN SAFE", "12 Volt Battery Charging System Problem", "Low Battery Charge. Power Reduced" and a red battery icon...

I bought a salvage 2012 Model S and jumped it twice. Moved car 50 feet into garage. 12 volts battery @ 12.09 volts Main Battery DEAD. I got my charge station set up to charge, Had to move it to the station it but the third time I shorted the bumper terminal to ground and now I cant do anything...