2014 CM2350 Emissions Issue

[tree98]

Sounds like it's time for an EGR tuneup. That involves replacing all emission sensors, imap, exhaust pressure, egr temp, EGR differential pressure.

Have the cans been baked lately? What is the average of the far right column of numbers if you look at aftertreatment history using insite? If it's 3 or over, you need to bake the dpf.

What are the Temps looking like while it's doing a parked regen? Is it even getting hot enough to do a regen or does it just keep trying and failing?

Will it pass a rail leakdown test?

This is unrelated to your current issue but has the fuel pump ever been rebuilt? They are only good for 400K miles or 8,000 hours. After that your rolling the dice with a complete and catastrophic loss of your entire engine.