My Check Engine light came on with 28 miles left in charge depleting mode. Stopped and called Onstar and they remotely read the fault code. They said the code is historical (not currently having a problem I guess he meant) and that the code was something to do with one of the cells in the battery. I was told while it was safe to drive I need to take it to my dealer ASAP to have it checked. That was yesterday. When I got home I had done a total of 44.6 miles on battery before the ICE came on, my best yet.
So in the morning Iíll call my dealer.
While itís there, they can also look at the right rear door that does not align up with the body very well, it sticks out about 2mm. Both rear lights have condensation in them, and occasionally the car will start instantly charging when I plug it in even though it is set to delayed charge after 7pm.
Iíll post an update when I have one.