Anyone know how to troubleshoot an E1020 low DPF differential pressure code?

[Spencer Cawoddy]

Hey guys, got an E1020 low DPF differential pressure code on one of my machines. The manual doesn't say much. Does anyone know what usually causes this? Sensor issue, clogged lines, or something with regen? Trying to figure it out before I start replacing parts.

 

[Robert M.]

It usually means the system isn't seeing enough pressure difference across the filter, not always a clogged DPF, often the opposite.