It is not using and def fluid..Welcome! how do you know it's not doing a regen? Are you tracking it with a monitor of some sort? If the truck is working properly, it's designed to be non intrusive to the driver so you know it's not in regen mode.
It always reported a regen in process before code change....It is not using and def fluid..
It is not using any DEF. fluid.....Did you buy it new? I'm guessing it had a GDE tune on it and since the dealer performed the AEM flash (and overwrote the tune) you no longer have the "regen in progress" report. My 2018 and I believe most all stock EcoD's do not report when the truck is regenerating, it all happens in the background.
Yes purchased new in 2015It is not using any DEF. fluid.....