ISB 6.7 - Crankcase pressure, constant clogged DPF

[zbot]

All- I have a 2013 Ford F750 with the Cummins ISB 6.7 with two issues recently that I’m guessing are connected. Two codes are recurring: crankcase pressure high and differential pressure high. The truck will do a forced regen from Insite, but gets the high pressure code again within a few hours of driving. Crankcase pressure code goes away during regen, but comes back within minutes of hitting the road.

So far: EGR has been cleaned, crankcase filter replaced, differential pressure sensor replaced, NOX module replaced.

This is a roll-off dumpster truck, meaning short routes and hours of idling/low power.

Where do I need to look next? And, yes, I’m ready to demandate, but I don’t want to mask any bigger problems that may be occurring in the engine.

Thanks!