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Fault: poor quaity DEF

Discussion in 'Questions From New Drivers' started by Nahbrown, Oct 25, 2025 at 11:28 PM.

  1. Oct 25, 2025 at 11:28 PM #1
    Nahbrown

    Nahbrown Medium Load Member

    424
    1,870
    Sep 6, 2021
    Illinois (the sane part)
    0
    Cummings I:SA 0 SPN 3364 FMI 10

    Thats the fault and google says it poor quality DEF, drain the DEF Tank or be ratioed
     
    Nahbrown, Oct 25, 2025 at 11:28 PM
    Nahbrown, Oct 25, 2025 at 11:28 PM
    #1
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  3. Oct 25, 2025 at 11:57 PM #2
    Espressolane

    Espressolane Road Train Member

    17,916
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    Just south of the north 40
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    Usually it will show up on the display as a def quality problem.
    No real need to do anything. Next time you get fuel, put in some fresh DEF. It should clear the problem.
     
    Last edited: Oct 26, 2025 at 12:06 AM
    Espressolane, Oct 25, 2025 at 11:57 PM
    Espressolane, Oct 25, 2025 at 11:57 PM
    #2
    Oxbow and lual Thank this.
  4. Oct 26, 2025 at 12:13 AM #3
    OlegMel

    OlegMel Medium Load Member

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    Apr 8, 2023
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    You sho
    You can drain the def and refill, it’s a 17mm bolt on a Volvo I believe. I would also replace the def filter. Another issue could be def quality sensor which is part of the def level sensor (rare but happens). get yourself OTR scan tool. They come in handy on occasions like these.
     
    OlegMel, Oct 26, 2025 at 12:13 AM
    OlegMel, Oct 26, 2025 at 12:13 AM
    #3
    Nahbrown Thanks this.
  5. Oct 26, 2025 at 2:30 AM #4
    Nahbrown

    Nahbrown Medium Load Member

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    1,870
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    Illinois (the sane part)
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    I had the def tested before Loves closed and the def is fine. The sensor is bad. Heres the problem, the truck thinks the def is bad and will ratio me after 190 mins.

    so we sit here until monday when a new sensor can be had and installed.


    This truck has cost me 2 Loads in the last 10 days. We are staying up late truck shopping online …
     
    Nahbrown, Oct 26, 2025 at 2:30 AM
    Nahbrown, Oct 26, 2025 at 2:30 AM
    #4
  7. Oct 26, 2025 at 3:11 AM #5
    Moosetek13

    Moosetek13 Road Train Member

    14,777
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    Nov 1, 2010
    Burnsville, MN
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    Or simply don't put water in the DEF tank, or pee in it.
     
    Moosetek13, Oct 26, 2025 at 3:11 AM
    Moosetek13, Oct 26, 2025 at 3:11 AM
    #5
    Nahbrown Thanks this.
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