Low coolant warning light and bell...

Discussion in 'Kenworth Forum' started by nomad3d, Apr 16, 2016.

  1. Old school 362

    Old school 362 Medium Load Member

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    Mar 6, 2016
    Pensacola Fl
    0
    Just like other person said. Plug for sensor . Some place the wire is rubbed through ot plug is bad.
     
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  3. JAYRODPA

    JAYRODPA Light Load Member

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    Apr 10, 2009
    Dingmans Ferry pa
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    KWCAM is right. if you replaced the sensor chances are there is a break in a wire. a lot of times it will be rite at the plug and you can't tell that it is. do a ohms reading from the plug down. worse thing would be a ecm problem. try disconnecting the computer wire from the battery's. I don't know if it works with the newer trucks but with the older trucks that will reset the computer.
     
    Last edited: Apr 19, 2016
  4. TruckHer777

    TruckHer777 Bobtail Member

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    Jun 4, 2018
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    At this point I think the only way to fix our demon Pete 579 is introducing it to Mr. Sledgehammer. This brain numbing dinging is just the latest electrical malfunction to grace us. 5 replaced SmartNav screens, countless faulty sensors, and a GPS that has never worked - causing weeks of shop time - that even Rush can't figure out... Nothing puts you into a financial hole quicker than an ecm lemon.
     
    GoBucks43228 and Oldironfan Thank this.
  5. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,604
    1,479
    Jun 14, 2009
    romulus,mi
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    If low coolant light is on and sensor/wiring has been checked, your problem is the surge tank itself. There is a "floating" metal slug that the sensor reads. That gets stuck. Only fix is to replace tank. Bad Paccar design. I have done many.
     
    D.Tibbitt, 98 star car and Oldironfan Thank this.
  6. cowboymagic81

    cowboymagic81 Bobtail Member

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    Sep 2, 2018
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    Did you ever get this problem fixed? On mine, it turned out to be the new sensor I bought was bad as well. I replaced it with another new one and it's fine now. Thankfully, cause the constant dinging was driving me mad...
     
  7. Oldironfan

    Oldironfan Road Train Member

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    5,509
    May 22, 2017
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    Just had this issue fixed by peterbilt. If sensor is bad, so is surge tank.
    Happens around 300,000. And again at 600,000 miles about.

    Modern technology is useless.
     
  8. Kwill710

    Kwill710 Bobtail Member

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    Nov 2, 2018
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    Unplug the sensor. Should be three wires in the plug. One will have 5 volts, one is ground(usually the white wire), and the other sends 1.5 volts or so to the ecm. Take a 200K ohm resistor and jump it from the 5 volt source to the return source wire and it should be a constant 1.6 volts going to the ecm. Don’t plug the sensor up because if it’s shorted it will up the voltage from the jumper and still shut the engine down. If this doesn’t work then you have a break in the wire somewhere between the plug and the ecm.
     
  9. FdEF

    FdEF Light Load Member

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    Dec 5, 2017
    Ogden, Ut
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    I've had the same issue on two different ISX. Both times ended up replacing the surge tank
     
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  10. cowboymagic81

    cowboymagic81 Bobtail Member

    9
    0
    Sep 2, 2018
    0
    I bough a new sensor off the net. No more dinging.
     
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