Cummins isx 15 cm 2250 Engine Compression brake output #2

Discussion in 'Volvo Forum' started by RoadRanger^^, Feb 16, 2026.

  1. Feb 16, 2026 #1
    RoadRanger^^

    RoadRanger^^ Medium Load Member

    317
    118
    Apr 17, 2018
    Columbus, OH
    0
    I was wondering if anyone has the same issue as me with the cummins cm2250. My truck has 6 stages of engine brake first three are working and 4,5,6 looks like they don't work. I have check warning on my dash but sometimes it goes away and also, I have noticed sometimes the Jake will work for a moment but mostly it does not. I'm assuming it is either Solenoid or wiring, but I am wondering if anyone knows how I can check if there is any shortage in the wiring from the ECM, which pins to trace?

    Thanks
     
    RoadRanger^^, Feb 16, 2026
    RoadRanger^^, Feb 16, 2026
    #1
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  3. Feb 17, 2026 #2
    dosgatos

    dosgatos Medium Load Member

    605
    1,311
    Sep 18, 2012
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    Go on quick serve under service, symptom search. A couple of topics for engine brake
     
    dosgatos, Feb 17, 2026
    dosgatos, Feb 17, 2026
    #2
  4. Feb 17, 2026 #3
    D.Tibbitt

    D.Tibbitt Road Train Member

    22,735
    157,141
    Apr 26, 2013
    Gettin' down westbound
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    What code is it throwing? It should be logged as an inactive fault.. if ur able to hook it up to insite or any code reader
     
    D.Tibbitt, Feb 17, 2026
    D.Tibbitt, Feb 17, 2026
    #3
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