I have a 2019 3500 duelly with the Cummins high output 6.7, w/ about 9,000 miles on it. I, too, am never alerted about a regen taking place. The only place I can see it is in the DPF screen in the dashboard LCD "instrument" panel. Currently the screen shows DPF at 25% and I am wondering when it will do a regen. These days in late summer I am really not driving anywhere--just around town. I live a great distance from Phoenix and my next trip isn't until Sept 13. When the DPF filter read 12% I did drive out at high speed (over 2,000 rpm) about 10 miles and then back and no regen occurred. Thoughts? Advise? Suggestions?