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.

  1. RunningAces

    RunningAces Road Train Member

    1,276
    2,520
    Jul 2, 2017
    0
    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.
     

    Attached Files:

  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. dosgatos

    dosgatos Medium Load Member

    560
    1,225
    Sep 18, 2012
    0
    Cummins Quickserve will have troubleshooting for each code. Usually starting with checking the circuit, then the device and the system. Follow the troubleshooting guide in order and you will find the problem.
     
  4. Iamoverit

    Iamoverit Road Train Member

    1,999
    4,444
    Oct 31, 2023
    0
    Pretty easy to check the wiring/harness.
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.