DEF ALWAYS FULL?!

Discussion in 'Volvo Forum' started by nodari, Dec 6, 2019.

  1. nodari

    nodari Bobtail Member

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    Sep 27, 2018
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    Hello guy's. please share your opinion... I have volvo 2011 cumins engine isx 15 . Truck doing Regeneration completely . but DEF tank always full?????? How and why it maybe happens?!

    thank you
     
    86mechanic Thanks this.
  2. emilko

    emilko Bobtail Member

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    Feb 4, 2018
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    Did you delete aftertreatment system, DPF, SCR? If an answer is "yes", than it is normal. I answer is "no", than it is not normal. I had situation After i have replaced DEF pump filter and cleaned aftertreatment system and cleaned the doser valve...everything came back to normal.
     
  3. Mudman78

    Mudman78 Light Load Member

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    89
    May 23, 2016
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    The float inside the DEF tank is sticking. You can pull it out and try to free it up (I've got it to work once or twice) or you'll have to replace the whole sending unit/heater.
     
    Rob100100 Thanks this.
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