DEF Mileage down

Discussion in 'Experienced Truckers' Advice' started by Drsparkey3, 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!
     
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  3. 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.
     
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  4. truckdriver31

    truckdriver31 Road Train Member

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    that one box is pretty expensive
     
  5. truckdriver31

    truckdriver31 Road Train Member

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    have you check the def filter
     
  6. Highroller58

    Highroller58 Bobtail Member

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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
     
  7. Drsparkey3

    Drsparkey3 Bobtail Member

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    Yeah, $7000.00
     
  8. Drsparkey3

    Drsparkey3 Bobtail Member

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    I'll try that. Thank you.
     
  9. Drsparkey3

    Drsparkey3 Bobtail Member

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    I'm thinking real hard about doing that. Thank you.
     
  10. 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.
     
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