If you use the progrmmer what happens to all the factory settings can you go back to factory setting if you
had to take truck in for service.

 

Ya the programmer saves your stock settings so you can allways switch it back to stock if you want to .

 

Any time you take it to the dealer you need to return it to stock. If you don't and they decide to flash your PCM with an update, you're screwed because you'll lose the program and have to send it back to get it reset.