Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › P0003a code on a 20011 Gmc 2500hd › Reply To: P0003a code on a 20011 Gmc 2500hd October 20, 2020 at 10:02 am #986779 Ray ThomasParticipant I think I’ll go ahead and have it towed. I drove a lot yesterday and what ever it is it will be big bucks to fix it. Wish I was home I think I could do it myself. Thanks for the help. Martin