11-16-2018,
I have a 2016 Peterbilt with a ISX15 that originally would regen ever 2 weeks. About 5 months ago it started to regen once a week. Now it regens once a day. There are no codes. It has 256,000 on it. Looking for any help as what to look at. Had my mechanic check the soot level in the dpf and the insite program said the soot levels were normal. Have not had the dpf cleaned.