This morning I got into my volt that has been running fine for quite a while and it said unable to charge, and started to count up the mileage guesstimate. In the end it appeared that it was fully charged, but when I drove it was stuck in Hold mode. I tried turning it on and off, and that didn't seem to help. I drove it about 20 miles in Hold mode and it acted a little strange. It had a hesitation at times, almost as if it was an ICE car with one cylinder that was misfiring. I also noticed that the air conditioning no longer worked. I tried charging the battery because I did have a problem with my 12 volt battery a while back and replaced it, but that doesn't seem to have helped. As I drive it it shows the traction battery as having no charge at all. I did stop it and start it another time and it showed the traction battery as fully charged, and the A/C started working, but then switch to Hold mode again almost immediately. Any ideas? I did a search and didn't see any other messages that seemed like this one. I have gotten no error messages, except for that one message that says Unable to Charge, with no reason. Thanks!