I was just driving along and everything was working just fine. Autostop was working, Charge/Assist was working and then....the check engine light came on!! Arrrgggghhh!! I was just a few miles from the dealer and it was early afternnon, so I wheeled on over and after sitting there for 3 hrs. the service guy came out and announced that my Hybrid battery had died. It will take 5-7 days to get a new one in from wherever they are. On the plus side, they put me in an '08 Vue with only 700 miles on it for a loaner. Not as nice as my Vue GL, but better than the Cobalt they stuck me in last time.