Mine did the same thing when I installed the hitch..left the hatch open too long ..thought I screwed up a wire or something(hard to do with a plug in set!)threw the charger on for 10 min and back to normal.Gotta watch those lites..had a glovebox lite stick on my truck too..went thru 2 batteries and charges before I found it..both juice boxes still good though!

 

My hhr did start up once after i let it set for a minute (after sitting in teh garage for a week or so. I let it run for a couple minutes. Then went upstairs to get tools, when I came back it would not start again. This was in a heated garage. All that was plugged in was my phone charger.