Low coolant sensor IXS

Discussion in 'Peterbilt Forum' started by Perchie15, Jan 18, 2022.

  1. Perchie15

    Perchie15 Light Load Member

    Aug 16, 2021
    I have a Peterbilt X15 Cummins engine and low coolant sensor comes on only when washboard I drive on and then sometimes goes off if I sit but other times it’ll stay on all day. The sensor has been replaced so that’s not it. If I unplug the sensor obviously it won’t go away since there seems to be a broken wire somewhere? But is there easy way to diagnose this? Or if I bypass the sensor would it keep the alarm from sounding that’s what I wanna get rid of.
    D.Tibbitt Thanks this.
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  3. chilibowl

    chilibowl Light Load Member

    Jun 28, 2013
    Houston Texas
    I just went through this on my Volvo Dd13. I did find a very small crack in my radiator and another in the reservoir. Replaced both. Still has the same issue. Replaced the sensor. Still had the problem . After a lot of reading I checked the DPF manifold that sent fluid through the DPF tank. There are two lines running through the DPF tank that use coolant from your radiator. That manifold was leaking like a sieve. If your getting a code telling you Bad DPF fluid you might have a pin hole leak on one of the lines running through the tank polluting the DPF fluid with coolant.
    Replaced the manifold and problem was solved.
    D.Tibbitt and QUALITYTRUCK Thank this.
  4. kwcam

    kwcam Light Load Member

    Dec 29, 2012
    at the shop
    Unplug the sensor and with a multimeter measure the voltage, should be 4.75 to 5.25 volts, then wiggle the wiring around and see if it drops out. I usually find the wire is broken inside the insulation with in a few inches from the connector, pull the pins out of the connector and cut the wire back then put on new pins, so the problem is fixed. I have seen where you can get a new complete connector with pig tail that makes it an easy fix.
    D.Tibbitt Thanks this.
  5. D.Tibbitt

    D.Tibbitt Road Train Member

    Apr 26, 2013
    Gettin' down westbound
    The coolant sensors on cummins/peterbilt are crap. Ive replaced 4 in the last 2 years. To get rid of the alarm just unplug the sensor itself. You will have a check engine light on.. If you just replaced the sensor then maybe your break could be in the wiring. Just trace it back from plug and see what you find.
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