Engine replaced on Freightliner Cascadia no communication with truck....

Discussion in 'Freightliner Forum' started by newskate, Jun 3, 2024.

  1. newskate

    newskate Bobtail Member

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    Jun 13, 2012
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    Hello I posted this issue in the general repair chat but i am thinking it might be freightliner specific.

    Replaced the Cummins ISX 15 engine No. 79830729 with a rebuilt Cummins ISX 15 No.79940637 epa16 model. Engine runs but i get no instrument readout in dash and display shows No engine and No ABS. I am wondering if i need to change something with the CPC4 to get it to recognize the engine. I don't know what exactly the CPC4 does so i am just guessing. Anyone hit this issue when replacing an engine? Also cannot access the engine thru the duech connector in truck. 20240601_090548.jpg
     
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  3. AModelCat

    AModelCat Road Train Member

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    Check that everything is plugged in and nobody pinched a harness during the swap.
     
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  4. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    NO CPC on Freightliner with Cummins engines. You have something on J1939 backbone unplugged, wire broken or rubbing shorted. Triple check all wiring/plugs.
     
    Magoo1968 and newskate Thank this.
  5. newskate

    newskate Bobtail Member

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    Jun 13, 2012
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    Ok does anyone know of any decent mechanic knowledgeable about these type of wiring issues in or around Boise Idaho…. I really need someone who is knowledgeable about this issue.
     
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