Does anyone know..... (2019 Freightliner )

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Commuter69, Jun 25, 2021.

  1. Commuter69

    Commuter69 Heavy Load Member

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    Jul 2, 2014
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    The other day, I was driving and suddenly, I had a check engine fault light(the one closest to the '20' on the tachometer) flash briefly and inconsistently. There was no change in performance, no gauges reading abnormally, and no fault codes showing up in the joke of a user interface on the dash......

    I checked all fluids when the engine was cold, and while I only needed to top off the coolant; it still persisted.

    I am actually home now, and put the truck in the shop for proper diagnosis and repair.... but, just to learn something, what could the problem causing issue be?
     
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  3. Commuter69

    Commuter69 Heavy Load Member

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    Jul 2, 2014
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    Update:

    Got it out of the shop yesterday and the coolant sensor was found to have failed.....
     
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