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Discussion in 'Freightliner Forum' started by Marcus P, Dec 5, 2020.

  1. Dec 5, 2020 #1
    Marcus P

    Marcus P Bobtail Member

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    Apr 8, 2020
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    I have a 2013 Freightliner Cascadia and I’m getting a code “ eng 1 snp 84 fail 21 what is the problem??
     
    Marcus P, Dec 5, 2020
    Marcus P, Dec 5, 2020
    #1
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  3. Dec 5, 2020 #2
    LoboSolo

    LoboSolo Heavy Load Member

    737
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    Jun 21, 2013
    Highway 20
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    I suggest asking this question in the Garage forums Diesel Heavy Duty Mechanics section, where someone who knows might see it.
     
    LoboSolo, Dec 5, 2020
    LoboSolo, Dec 5, 2020
    #2
    d o g and D.Tibbitt Thank this.
  4. Dec 5, 2020 #3
    AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    Fault codes are more or less standardized nowadays. You can pretty much Google the fault code and get a basic description.
     
    AModelCat, Dec 5, 2020
    AModelCat, Dec 5, 2020
    #3
    d o g and D.Tibbitt Thank this.
  5. Dec 7, 2020 #4
    SWM_TECH

    SWM_TECH Light Load Member

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    Apr 15, 2018
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    SPN 84/ FMI 21 is for Vehicle Speed Sensor is Erratic. Here is the diagnostic steps to help troubleshoot the fault.
     

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    SWM_TECH, Dec 7, 2020
    SWM_TECH, Dec 7, 2020
    #4
    RocketyMan Thanks this.
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