SPN 570371, SPN 520372 & SPN 523002

Discussion in 'Freightliner Forum' started by sonnyca, Nov 16, 2024.

  1. sonnyca

    sonnyca Light Load Member

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    Oct 19, 2023
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    Hello Folks!!
    I had these 3 codes came last night and today got my truck washed, and turned it on after being shut down for 30-40 minutes. All these codes are gone. Do I need to do anything?
    SPN 523002 FMI 31 has been on showing in Samsara from last 15 days I would say but no lights in dash but last night Amber light was on the dash. Please see the image attached for the list of codes on 2022 Cascadia with 489K miles.
     

    Attached Files:

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  3. xsetra

    xsetra Road Train Member

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    sonnyca Thanks this.
  4. sonnyca

    sonnyca Light Load Member

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    Oct 19, 2023
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    Appreciate it but I am curious now these codes are gone. What are my options ?
     
  5. 062

    062 Road Train Member

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    They’re not gone,just inactive.
    You have a problem with the after treatment system.
     
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  6. sonnyca

    sonnyca Light Load Member

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    Might be a stupid question but I still have extended warranty left on this truck. Ya’ll think it should be covered?
     
  7. 062

    062 Road Train Member

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    Depends on what is covered by the warranty.
    You may have a nox sensor going out. Could be the def doser seal leaking.
     
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  8. sonnyca

    sonnyca Light Load Member

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    I will check the Def Doser seal at local mechanic… I appreciate your input very much..
     
  9. 062

    062 Road Train Member

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    Doser seal is easy to see if it’s leaking. If you have the full fairing,slide under the truck and look for def buildup around the rear bottom corner of the one box.
    While under there look for def or soot coming from the bottom of the one box.
     
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  10. sonnyca

    sonnyca Light Load Member

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    Local mechanic is saying it’s DEF PUMP. I had it changed around this year in February on road.
     
  11. 062

    062 Road Train Member

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    Did he do any testing to make that diagnosis?
     
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