Def

Discussion in 'Questions From New Drivers' started by Erjonb, May 9, 2021.

  1. Cowboyrich

    Cowboyrich Road Train Member

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    Dayton, Washington
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    My truck will do this occasionally, between about 3/4-1/2 tank of fuel then suddenly drops, atleast its manageable if you know what it is.
     
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  3. Erjonb

    Erjonb Light Load Member

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    Aug 27, 2019
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    Yea but i have that text that engine will derate. And today is Sunday so nobody's working
     
  4. sevenmph

    sevenmph Road Train Member

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    Pinellas county Florida
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    If it derates unplug the speedsensor from the transmission. Your speedo won't work but you will get where you're going.
     
  5. Erjonb

    Erjonb Light Load Member

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    Aug 27, 2019
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    Im heading to Texas, so its better if i just stay where i am for tonight. Thanks for the suggestion tho
     
  6. SoulScream84

    SoulScream84 Road Train Member

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    2012 it should be manual, but if it's an auto unplugging the speedsensor will keep the trans from shifting.
     
  7. Erjonb

    Erjonb Light Load Member

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    Aug 27, 2019
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    Its an i shift
     
  8. Cattleman84

    Cattleman84 Road Train Member

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    The Sticks, Idaho
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    Ive driven auto shift Volvos with the speed sensor unplugged... It will still shift, but it wont build any boost... So its gutless.
     
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  9. Atlaw4u

    Atlaw4u Heavy Load Member

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    Try disconnecting the batteries for a few minutes. I had a similar issue and this worked to reset the system and it let me travel a few hundred miles before it did it again.

    Odd thing was it ultimately appears to have been the wire going to the 7th injector (doser) was getting too hot. I noticed the wire lost it's insulation and had dropped down from its normal position along the valve cover and was laying on the side of head.
    Once I reinsulated and rerouted it to a cooler location the problem has not reoccurred.

    However, I don't recall that my DEF gauge was acting up.
     
    Last edited: May 9, 2021
  10. SoulScream84

    SoulScream84 Road Train Member

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    I suppose it's a YMMV situation. Had a Mack with the M shift and it wouldn't go higher than 3rd with the sensor removed.
     
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  11. Truckermania

    Truckermania Road Train Member

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    Oct 13, 2011
    Sturgis,SD
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    Do a parked regen. Should take care of it.
     
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