I have been watching this thread with some interest. Maybe I'm worrying about nothing, just seems like the '22s have some ... issues in this area my 2020 did not seem to have. (I have a 2022 HO). Close to 10k miles, I've done several empty trips and pull a ~15k 5th wheel. (I really need to run it over the scales). Anyway, I don't have another vehicle and don't really want one, so it's a daily to run around town and do errands when I need to, before someone tells me I shouldn't use it for a grocery getter.
I don't like to do the short trips, but that's my situation. Having another vehicle around really isn't feasible, though I'd love to find something sporty, the appropriations committee (i.e. my wife, will not approve the expenditure, lol) I haven't gotten any codes, but I did recently get a pair of Banks iDash monitors and I love the visibility. I need to start some data logging, but I haven't gotten around to it yet.
I monitor the miles between regen PID, there's a DPF % PID (can't remember exactly the name), when it goes to 100% regen kicks in. It's no surprise when I have several short trips around town without pulling the camper, my miles between regen drops to around 320. Pulling/empty and highway speeds I never see much in the way of regens except the ones that are time-based.
An observation/theory I'm forming is the conventional wisdom around locking out 5th/6th gears when going around town is actually not as helpful one might think. Volume of air going through the system isn't has helpful as higher temps. Watching EGT1/3, the temps are a lot higher if I let it drop into 5/6th gear and lug a bit. I did some research and it's basically air volume -- more air at higher RPMs actually cools things down and higher temps should, in theory, help passively regen/clean. Far as I can tell, my DPF is currently 'clear', the % 'full' PID was at 17% when I got back from a trip this morning. I pulled the trailer this weekend and it did an active regen right when I hitched up. I'll see if I can add some more data on a truck that's ostensibly working (mine
)the way it's supposed to, although 3xx miles between regens kinda sucks IMO. Not as bad as what you're seeing, but not great.