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Freightliner Cascadia 2023 SCR Issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by EddySmith, Sep 28, 2025 at 12:19 AM.

  1. Sep 28, 2025 at 12:19 AM #1
    EddySmith

    EddySmith Bobtail Member

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    Hello there good people
    I have Freightliner Cascadia 2023 with DD15 and truck went into Stage 2 - Torque Derate for some reason
    5 minutes after, on the dashboard i found couple of fault codes related to DEF System. DEF Level was just a bit below the maximum.

    Went at the closest Speedco and they did SCR Test and Forced Regen, and unit passed SCR Test. Forced Regen was also sucessful but codes won't go away. And they can't delete the codes ( Picture of codes attached ).

    What it could be ?
     

    Attached Files:

    EddySmith, Sep 28, 2025 at 12:19 AM
    EddySmith, Sep 28, 2025 at 12:19 AM
    #1
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  3. Sep 28, 2025 at 10:48 AM #2
    062

    062 Road Train Member

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    I would recommend finding a shop that uses diagnostic link 8 or a dealer. Once the root cause is fixed it will need scr efficiency tests performed to bring the nh3 level up to a 1.
     
    062, Sep 28, 2025 at 10:48 AM
    062, Sep 28, 2025 at 10:48 AM
    #2
  4. Sep 28, 2025 at 12:07 PM #3
    Goodysnap

    Goodysnap Road Train Member

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    Not a Detroit guy but it looks like you probably have an outlet Nox driving the DEF dosing rate to max. As stated you may need OEM software to disable derate.
     
    Goodysnap, Sep 28, 2025 at 12:07 PM
    Goodysnap, Sep 28, 2025 at 12:07 PM
    #3
    Diesel Dave Thanks this.
  5. Sep 30, 2025 at 5:44 PM #4
    EddySmith

    EddySmith Bobtail Member

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    Thank you guys.
    Truck is still at the dealership, i'm waiting for their answer on the situation.
    Do you think these codes could have something in common with codes for injector ?
    I had couple of fault codes recently for Injector No.6 - Electrical issue.
     
    EddySmith, Sep 30, 2025 at 5:44 PM
    EddySmith, Sep 30, 2025 at 5:44 PM
    #4
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