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 November 8, 2020 at 3:32 am #987015 Richard KirshyParticipant Glad to hear you got it sorted out, through sorry to hear about the cost.