Originally Posted by SchnauzerKing

I wondered about that. I went back to the shop that did the work on the truck and they told me about the EPA and the horror stories from BullyDog. They told me to lay low for a while and do not go back to the dealer. My other local mechanic no longer has the scanner needed. He suggested the dealer as well but thought I would run into problems.

I do not understand this completely. You are saying there is a way to reset the tire size without effecting oh I don't know. Let's say a delete. Just for an example. If someone was to remove the DEF system for argument sake, not that I would, but let's say it had been. The program was changed to ignore certain sensors. Whatever module or system that controls tire sizes is different than that of the engine?

I would love to have my system calibrated to the larger tire size but I am afraid the dreaded 500 mile to total shutdown timer would kick in. Been there. Done that. And it is no fun.

Maybe the issue is LT265/75R16's are not an built in option, thus the rewrite. My service truck is an Express Cut-Away. It has LT225/75R16's. So I would say that would be a built in option.