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2012 Dodge Ram 2500 Tire Size, ABS, Speedometer, Traction Control Issue??
I bought a 2012 Dodge Ram 2500 Diesel back in January. I had the dealer swap out the stock tires with BFG AT KO 315/70/R17s D range (max 50 PSI) that I had on a 2007 Dodge 2500.
When the dealer did this the computer went crazy. The TPMS light was on as was expected, but a whole bunch of other problems popped up. The speedometer showed exactly double speed (measured with GPS), at 15-20 mph the abs light turned on, the traction control turned off and the cruise control wouldn't work.
Took it back to dealer, they said you can only run max 285/70/R17 tires with E load range of 80 PSI and that was supposed to fix all of the above mentioned problems. I bought the BFG 285/70/r17 tires and away I went. Well the speedometer is off 5-7 mph depending on speed, but that's not really a big concern as all of the other issues were resolved.
What concerns me is that I know people are running 315s on their Trucks without this issue. I thought well maybe it has to do with Tire pressure and I dropped all tires to 45 and did a test. As expected only the tpms light came on and everything was fine otherwise.
I still have the 315s, but would be looking at $60 to put them back on and see if the issue still exists and another $60 to take them off if they did.
Can someone provide some type of explanation as to why this happened or why a 315 vs a 285 would case the speedometer to be off by double?
Are any of you guys running 315s on a 2012 2500?
I need help please. I thought I had this issue resolved in my head, but I have the sweet 315s staring at me and from a logical standpoint the issue just doesn't make any sense.