So I have not been plugging in my 2013 volt lately, as I have another vehicle under maintenance taking up the garage space. Overnight it dropped to about -18°F and now it seems that the vehicle has no power whatsoever. No power locks, nothing on the dash or center stack, I can't even open the trunk because hit has an electronic latch. I have seen some people say to plug it in and let it warm up, but it has been plugged in for about 6 hours with an extension cord (not thrilled about that), and so far nothing to show for it. Really hoping someone has resolved a similar issue and can point me in the right direction to resolve this!