Your probably at the end of life for the DPF. Or getting close. I only have 40,000 miles and keep driving cleaning exhaust came up once and I spend more time on the highway than city. So I have no idea what that was about. I run the torque app and didn’t see anything other than it was time for a typical regen.150,000 miles. Main issues are EPA exhaust Junk. Replaced a few sensors but get dash light for not regen often enough. only issue now is getting timing belt and water pump replaced due to parts shortage. Can't find places outside of dealer to work on engine. Otherwise, truck runs great and still does all I bought it for.
Then the other day it came up x miles till max speed. But that went away. The torque app was showing crazy values for the second nox sensor. At this time the second nox sensor stays at zero most of the time.
To many poor quality sensors on diesels now days..