2017 t680 isx15 2350 roughly 800k miles
Been having issues with codes popping up for the aftertreatment system. Through a couple new sensors at it and nothing has worked. The pressure levels were reading correctly but I was still getting codes.
Today though I got a laundry list of codes all at once. I took a screenshot of them and they are all fmi 9. Ignore the coolant level code that's a separate issue. With all these codes popping at the same time im thinking the aftertreatment wiring harness or maybe the ecm? Also why would the anti lock brake code have come on if it was the aftertreatment harness?
I have been using the OTR reset tool to clear the old codes and do forced regens if it matters.
Thank you for any help.
All the codes for aftertreatment all at once?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RunningAces, Jun 28, 2025 at 10:52 PM.