The older cars compared speed/gear/rpms on a table in the computer. Any variation from the set amounts will trigger the CEL. It's such a close variant that a good burnout at the wrong time can trigger it. I did it twice on my '13 R/T, because I changed tire sizes.So there is a difference between pre and post '15 but I still don't understand why there's no (or less?) care for changes in the post 15 vehicles Is it because speed sensors on the front wheels measure absolute tire rotation as opposed to driveline rotation? Speed sensors in the earlier cars have them in the rears - or are these for ABS only?
After the 2nd one, I took it to the dealership and they flashed the TCM, did an update and I didn't have any more trouble with it.
The newer cars measure speed from the fronts and that table was removed from the computer.
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