X15 constant regeneration

[Therealarw]

Hi everyone,

I’ve come across one of my trucks and I’m completely stumped on it… It’s a 2019 Peterbilt with an X15 engine in it.. lately it’s been going through a regen almost every single day. Constantly just high rpm at idle when the truck is stopped even when the parking brake isn’t set it goes off. There’s no check engine lights for it nothing inactive or active either. I had an extra DPF DOC and the SCR catalyst from another truck (everything was the same for part numbers) and it’s still going through this regen stage… Only things I haven’t done on it are an ECM calibration, or ran the rack on it or checked the injectors. From what I understand these engines don’t have a 7th injector and instead the 6 fuel injectors are what atomize the fuel that goes into the exhaust system. Another thing before I forget is that I did the aftertreatment maintenance reset when I did the filters. I feel like I’ve looked through about everything on the truck but maybe I am missing something? Part of me feels like maybe the ECM might be glitched and it’s seeing something either pressure or temperature related that actually might be false causing it to constantly regen? I’m not too sure but it’s been a pain in the a** and the driver who drives this trucks worried that it’s gonna eventually hurt the motor. Thank you guys for checking this out and hopefully we can figure this out!

Thanks!
Adam