RamKing70
Senior Member
I have a 2016 ram express. I upgraded my tires to 35" from the 33s that were stock. I have a Matco MaxMe tablet to change the tire size for the speedometer. I see that the computer requires the figure in mm for circumference. I believe the 35" tires are 2791mm circumference. However, when I set the computer to that size, my speed is still off. When I set the cruise to 60, my GPS says I'm doing 57. I tried going back to the stock size setting, set the cruise to 60, my GPS speed is 62-63. I can't find any other setting that the computer will accept. My steering would also not work properly, studdering and stiff. I get 4 wheel drive temp not avail. I don't know how to reset the BCM or TCM. I have DTC codes (00,03,d4,12), P1614-00. I was also getting P1DB6-00, P215C-00. I think the only one now it P1614. My check engine light was on for a while. I got it turned off but still have the 1614 code. Sometimes the light would come back on after a restart. I did get it to stay off.