[auleanne]

Thank you aFrench for the reply! I think I have a DPF sensor going bad but it could be the ARD. It all started with 321 and 319 error codes on the engine monitor. We stopped at the CAT shop in Spokane, they did a forced Regen, they thought it was a sensor but couldn’t get it to error again. The errors resurfaced after 800 miles and quickly went into Derate mode with the 501 high soot load. I stopped at another Truck repair shop and there software indicated a clean DPF filter so I think the ARD maybe ok. We’re now stuck in Bakersfield waiting on the CAT shop to open on Monday, finger crossed.

I did put the ANCEL HD 3600 scanner on order, it should allow me to force a Regen. I will post my findings in case anyone else has this issue in the future.