SPN 4334 FMI 18

Discussion in 'Trucks [ Eighteen Wheelers ]' started by tobie town trucker, Feb 8, 2019.

  1. Goodysnap

    Goodysnap Road Train Member

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    The information direct from QSOL says it is.
     
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  3. Heavyd

    Heavyd Road Train Member

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    Ok, what is it?
     
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  4. mhyn

    mhyn Road Train Member

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    I was wrong, you are correct. I was thinking it's low nox conversion code.(4364)
     
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  5. spsauerland

    spsauerland Road Train Member

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    Don't feel bad, I did too through a quick Google search and by parts replaced.
     
  6. Grumppy

    Grumppy Trucker Forum STAFF Staff Member

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    [I'm not going to get into this conversation because I know less than zero about diesel engines & less about DEF but.. I learned long ago on old pre-80's gas engines.... look at the simple stuff. Possibly a bad sensor rather than the system itself?]
     
  7. Goodysnap

    Goodysnap Road Train Member

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    The pressure sensor is internal to the dosing unit/pump and has allready been replaced.
     
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  8. uncleal13

    uncleal13 Road Train Member

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    Low or erratic DEF pressure.
    Don't know about Cummins, but Detroit has a little tiny filter where the def line goes into the def injector.
    Funny thing is, the def system on a Detroit is made by Cummins
     
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  9. Samuel2736

    Samuel2736 Bobtail Member

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    I'm curious to know if you were able to get the problem resolved... I'm having exact same issues already spent 4k
     
  10. Samuel2736

    Samuel2736 Bobtail Member

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    Dec 2, 2019
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    Were you able to find the problem? Same thing happening to me with my 2013 cascadia already dropped $4k and light came back up.
     
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