While driving my 2010 Acadia SL one night the doors unlocked and locks about three time and motor seemed to stumble just a little. Turned around to head home and drove fine no problems for about 20 minutes. Next morning went to start and it ran for about a second then died. Tried to restart and engine cranked for about half a second then stopped. Now it does not turn over at all and no noise from engine bay. Rear hatch also won't open with remote, button on dash or button on hatch itself. Engine light is not on but there is a code U0100 ECM or PCM not communicating.