2016 Volvo d13 asking regen after regen.

How to check the DPF sensors on a 2016 Volvo VNL? - Bing video

 

Your fault code is related to SCR operation.
SPN 4364 FMI 1 Engine Error Code | SPNFMI.com
You may have a bad NOX conversion.
You engine might de-rate suddenly.
That's probably the cause.
The constant need for Regen may not have anything to do with the Particulate Mater sensor or the DPF filter.

 

Have you put a bad batch of DEF in your tank recently?
More water than urea, maybe?
How to test your DEF quality:
How to test your DEF quality? - Bing video

 

I'm thinking either something is not working correctly to reduce NOx levels, or your sensors are reading incorrectly. Don't mess around with the DPF, differential pressure sensor, or 7th injector, since they're related to reducing soot levels. You're going to need someone with PTT who knows how to troubleshoot each component, or else it's going to be a guessing game.

DEF quality can be tested with a refractometer. The DEF doser can be tested by commanding it to spray with the computer and then measuring how much comes out. The EGR valve can be tested to make sure it actuates and also that it stays closed when it's supposed to. I'm pretty sure PTT can display the NOx levels at the inlet and outlet sensors, and then you determine if those values are accurate. Inspect the exhaust system for leaks, especially the weld at the flange where the DEF doser bolts into the DPF canister. At this point, if everything checks out, it might be time to replace the SCR box. You could also try cleaning the SCR box, but there's no guarantee that it will work.

 

If you have PTT Diagnostic you can check it under NOX Conversion Test - it should be 80%+.
Also, at the given mileage if the filter wasn't baked it should start making problems.
Clean the filter and perform Forced Regen via diagnostics (longer one of 90min) to clear SCR System buildup.

 

When the similar truck I used to drive did that it was a mostly plugged DPF filter...

 

I recently saw how a fully plugged DPF filter looked like.
An apprentice was asked to clean it up.
He worked for 2 full days with a small pick hammer chiseling the deposits inside.
There was rock solid soot in there.
I would have thrown the whole thing out and bought an aftermarket filter.