Originally Posted by Ozer

I tried jumping it, battery showed 11.6v prior to hooking it to the other car, during the jump it showed 13.6v bit after waiting for few minutes it still doesn't crank over and i still get the pre heating message. I have all 6 GP codes and 6 GP circuit codes. Erased and tried again but no change.
Could it be the GP control unit? It was working fine prior to yesterday. No start or rough idle issue.