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Cummins Isx crankcase pressure code

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tiny T700, Apr 21, 2020.

  1. Apr 21, 2020 #1
    Tiny T700

    Tiny T700 Bobtail Member

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    Apr 21, 2020
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    I got an cel on my Isx motor and the code read "Crankcase Pressure " . I took out the old filter wich were really bad and full of oil and replaced it with the 'no maintenance ' newer one. Started it up and the cel was gone. Drive it for about 30miles and it pop up again . Truck runs normal and no overheat or oil pressure issues. Any advise off where else the problem might be ?
     
    Tiny T700, Apr 21, 2020
    Tiny T700, Apr 21, 2020
    #1
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  3. Apr 21, 2020 #2
    pushbroom

    pushbroom Road Train Member

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    Wiring to the crankcase pressure sensor is probably faulty. Sensor is in the top LH of the filter assembly. Pull the loom off and inspect the wires, also give them a pull test, lots of times they are broken internally an just stretch out and snap. Dealers will sell a pigtail and pins for it. P/N 5299153

    This is providing the current check engine light is still for the crankcase pressure. Might be worthwhile to get it on a laptop so you arent chasing your tail
     
    pushbroom, Apr 21, 2020
    pushbroom, Apr 21, 2020
    #2
    TallJoe, Goodysnap, QUALITYTRUCK and 2 others Thank this.
  4. Apr 21, 2020 #3
    Tiny T700

    Tiny T700 Bobtail Member

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    Apr 21, 2020
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    Thanks I will check the wires before i take it for diagnostics.
     
    Tiny T700, Apr 21, 2020
    Tiny T700, Apr 21, 2020
    #3
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