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DEF Mileage down

Discussion in 'Experienced Truckers' Advice' started by Drsparkey3, Mar 11, 2020.

  1. Mar 11, 2020 #1
    Drsparkey3

    Drsparkey3 Bobtail Member

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    What would cause my DEF mileage to start dropping? Could a bad one box be doing it? I have a 2013 Cascadia with a 2012 dd15 in it. ANY help would be appreciated!
     
    Drsparkey3, Mar 11, 2020
    Drsparkey3, Mar 11, 2020
    #1
    truckdriver31 Thanks this.
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  3. Mar 11, 2020 #2
    wichris

    wichris Road Train Member

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    The metering can be adjusted. Have it flow checked. Had a few that dropped all of a sudden from 250mpg to 180mpg.
     
    wichris, Mar 11, 2020
    wichris, Mar 11, 2020
    #2
    Drsparkey3 and truckdriver31 Thank this.
  4. Mar 11, 2020 #3
    truckdriver31

    truckdriver31 Road Train Member

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    that one box is pretty expensive
     
    truckdriver31, Mar 11, 2020
    truckdriver31, Mar 11, 2020
    #3
  5. Mar 11, 2020 #4
    truckdriver31

    truckdriver31 Road Train Member

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    have you check the def filter
     
    truckdriver31, Mar 11, 2020
    truckdriver31, Mar 11, 2020
    #4
  7. Mar 11, 2020 #5
    Highroller58

    Highroller58 Bobtail Member

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    Sep 18, 2016
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    Sorry your going through that .My 2012 caused me so many problems but usually when my DEF mileage dropped it was a knox sensor getting ready to go ,good luck i finally did a delete after replacing the knox sensors more times than I can remember and everything else from harnesses to the one box and continued to have problems until the delete been 3 yrs and no problems
     
    Highroller58, Mar 11, 2020
    Highroller58, Mar 11, 2020
    #5
  8. Mar 13, 2020 #6
    Drsparkey3

    Drsparkey3 Bobtail Member

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    Nov 30, 2019
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    Yeah, $7000.00
     
    Drsparkey3, Mar 13, 2020
    Drsparkey3, Mar 13, 2020
    #6
  9. Mar 13, 2020 #7
    Drsparkey3

    Drsparkey3 Bobtail Member

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    Nov 30, 2019
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    I'll try that. Thank you.
     
    Drsparkey3, Mar 13, 2020
    Drsparkey3, Mar 13, 2020
    #7
  10. Mar 13, 2020 #8
    Drsparkey3

    Drsparkey3 Bobtail Member

    31
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    Nov 30, 2019
    0
    I'm thinking real hard about doing that. Thank you.
     
    Drsparkey3, Mar 13, 2020
    Drsparkey3, Mar 13, 2020
    #8
  11. Mar 15, 2020 #9
    mover man

    mover man Road Train Member

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    Ya good luck on finding someone have reputable to it. The EPA starting cracking down and given out HUGE fines to companies doing it. If ya do find someone you can trust. PM it to me.
     
    mover man, Mar 15, 2020
    mover man, Mar 15, 2020
    #9
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