There is a superb post over in the 4th Gen forum about this topic. However, I wanted to see about adding something for folks with 5th Gen trucks as they are clear to indicate in red that their info is only good for trucks up to 2018. Mine is a 2019 RAM 2500 so some say it’s a “Gen 4.5” but it’s new to me in any regard! Perhaps some of the 4th Gen info is directly transferable to us here, but that’s for us to determine going forward. Maybe some of the key contributors on the 4th Gen forum will want to update us as well. So, you want to do a few retrofits or enable a few features on your 5th Gen? For example, in my case I am dealing with two things right off. First, I added factory halogen fog lights to my Tradesman and now I want to enable them. Second, I bought a retrofit kit for a UAX 12” infotainment system and everything is great except for the climate controls. My truck came with the UAA 5” radio and manual temperature control (MTC). The 12” screen is touted as providing the automatic temp control (ATC) even if the truck didn’t come that way. Uh, not so much or at least not quite, yet... While I wait for my vendor to send me their solution I am going to see if I can simply return the truck to MTC and hope that the sliders in the radio screen will stay there to allow me to adjust the temp hotter or colder - just like the knobs did. I’ll write a bit about how to get the coding part rolling next.