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W900 Shuts down, changed oil pressure sensor, low voltage to ecm

Discussion in 'Ask An Owner Operator' started by JonasTtrucker, Sep 27, 2018.

  1. Sep 27, 2018 #1
    JonasTtrucker

    JonasTtrucker Light Load Member

    53
    1
    Apr 26, 2018
    St. Louis, MO
    0
    About a month ago my W900 starting to go to slow idle and when pulled over the engine shutoff. Thought it was a sensor or a bad computer, but in the Morning the truck started right up and ran for a month no issues until yesterday.... yesterday the truck did the same thing accept this time haven't been able to drive it. Got an error code saying oil pressure sensor and low voltage to the computer and replaced the oil pressure sensor and tried another computer with the same issue. After starting the engine sometimes a few minutes sometimes 10 minutes the engine will shutoff... any ideas?
     
    JonasTtrucker, Sep 27, 2018
    JonasTtrucker, Sep 27, 2018
    #1
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  3. Sep 27, 2018 #2
    Cattleman84

    Cattleman84 Road Train Member

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    The Sticks, Idaho
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    Bad connection or wire going to computer??? Just spit balling, I'm no mechanic.
     
    Cattleman84, Sep 27, 2018
    Cattleman84, Sep 27, 2018
    #2
  4. Sep 27, 2018 #3
    fortycalglock

    fortycalglock Road Train Member

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    Jun 25, 2011
    Tourist Town, FL
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    Bad power or ground to the ECM.
     
    fortycalglock, Sep 27, 2018
    fortycalglock, Sep 27, 2018
    #3
    boneebone and AModelCat Thank this.
  5. Sep 27, 2018 #4
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Diagnose it, don't start throwing parts at it. 99% of the time its wiring, not sensors or computers.
     
    AModelCat, Sep 27, 2018
    AModelCat, Sep 27, 2018
    #4
    peterbilt_2005 Thanks this.
  7. Sep 27, 2018 #5
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    Also check chafed or loose wires around the starter, battery and ECM.
     
    boneebone, Sep 27, 2018
    boneebone, Sep 27, 2018
    #5
  8. Sep 28, 2018 #6
    MysticHZ

    MysticHZ Road Train Member

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    5,696
    May 28, 2010
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    Or sometimes it's what the sensor is monitoring is actually bad. My last truck had similar symptoms ... The oil pump was going.
     
    MysticHZ, Sep 28, 2018
    MysticHZ, Sep 28, 2018
    #6
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