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many def and dpf codes

Discussion in 'International Forum' started by Ed's Bus Shop, Dec 30, 2025 at 7:22 AM.

  1. Dec 30, 2025 at 7:22 AM #1
    Ed's Bus Shop

    Ed's Bus Shop Bobtail Member

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    Hello. I am looking for help with my 2017 IC ce300 school bus with a Cummins ISB engine. I am getting many DPF, DEF, and also VGT codes. I already switched out the DEF sending unit witch I have had problems with in the past. Can anyone help figure this problem out?
    OEM CODE 1894, 6688, 3868, 6652, 3232, 2771, 4152, 4151, 5177, 4677, 4572, 6613, 3714
    I tried clearing the codes and all of them came back with key on engine off.
     
    Last edited: Dec 30, 2025 at 10:01 AM
    Ed's Bus Shop, Dec 30, 2025 at 7:22 AM
    Ed's Bus Shop, Dec 30, 2025 at 7:22 AM
    #1
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  3. Dec 30, 2025 at 4:15 PM #2
    Heavyd

    Heavyd Road Train Member

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    All those codes are components not communicating to the engine. They all share the same power supply except for the VGT. When you have a bad power supply, the VGT will not be included because it has a different power supply. After that they all share the same communication wires. Now welcome to one of the most complicated diagnostics in commercial trucks there is. Datalink troubleshooting. With the key off you should have about 60 ohms of resistance between the yellow and green wires at any sensor connector that is coding. Find one you can get to easily and check there. DO NOT use the turbo VGT. If you are getting 60 ohms, then it is possible a sensor has failed and it is corrupting the data on the whole network. The only way to find this is to unplug a sensor one at a time to see if the rest of the codes go inactive. 90% of failed sensors are Nox sensors, so I would start with those.
     
    Heavyd, Dec 30, 2025 at 4:15 PM
    Heavyd, Dec 30, 2025 at 4:15 PM
    #2
    dosgatos and Ed's Bus Shop Thank this.
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