JUST FIXED THIS EXACT SAME PROBLEM A FEW DAYS AGO. ON MY TRUCK THERE WAS A LOOSE WIRE IN THE SEAT HARNESS ON THE PASSENGER SIDE FRONT SEAT, NOW SINCE YOU REPLACED ALL YOUR SEATS YOU NEED TO CHECK ALL SEATS WHERE YOU REMOVED WIRES TO REPLACE SEATS YOU EITHER TORE A WIRE OR PULLED ONE APART DURING REMOVAL OR INSTALLATION. GOOD LUCK
I HAVE AN 05 GMC SIERRA 5.3 GAS 2WD TRUCK. THE DIC SAYS 13.1 MPG. AND DOES NOT CHANGE THIS IS INCORRECT. AND I WOULD LIKE TO KNOW HOW TO RESET THE DIC. ANY HELP GREATLY APPRECIATED.