Can ford tell if you put a programmer on your truck even after you set it back to stock?

 

They shouldnt be able to, but you don't know what exactly they look for to see if you did, so its hard to say that just returning it to stock doesnt leave so kinda red flag for them to see. But I don't honestly believe they really look at that when you bring your truck in, but they might.

 

From what I know the tuner saves your programming, and moves it back to the truck when you return it to stock. From that standpoint they should not know.

But this is also the reason the stock tuning must be return to the vehicle when taking it in for service. The dealer may not only scan the programming, but change it in response to recall or TSB. If they do that while you have something other than the stock tuning on the vehicle, your tuner will be useless without reprogramming it.

 

I'm interested in your question as well. Maybe a Ford tech will come along.

 

yes they can, im learning diagotics and my instructor at uti said when u program the pcm then return it to stock to take it to the dealership they can read the codes, not the one for the pcm others and know the exact time you program it and when u return it to stock. the codes they see will have a pause in it when the pcm is blank when your reprograming it. and then the code they see after you program it will be different from the code that was there before you ever touched it.