Help to identify unknown tuner/tunes
I have a 2015 3500 that I purchased lightly used. It came with a PPEI shift on the fly switch hooked up, but I rcvd. no details on tuner or tunes, and there is no module or anything either. Lots of emissions sensors and such are disconnected (I get no warnings) and no issues. I’m in Alaska and don’t have any emissions rules.
How can I determine what Tuner and Tunes it has?
Also, Is DEF fluid removed from the operating equation with tuners and deletes?
This truck has never said I was anything but OK w/ DEF and I’ve never added it???