Thank you for the reply. I guess I was just being paranoid. There was a burnt smell coming from the truck and I was worried about messing something up. It ran for a little over ten minutes with no change, so i thought it might not work properly with the see dealer message on the screen. After a little more research I guess the time and smell is normal for a stationary regen. I'll start it again tonight and report back.Why stop the regen? Might as well see if it completes. It's normal not to smell DEF during a regen. The DEF system is not active during the regen.