2011 Volvo vnl 780 ishift

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mvolvo2011, Aug 6, 2020.

  1. Mvolvo2011

    Mvolvo2011 Bobtail Member

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    Aug 6, 2020
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    My trans suddenly started to stall when shifting off the start at a light or turning onto on ramp and when it stalls for a split second the rpm shoots up and then back down and it shifts... what is causing this!? Also when it shifts into different gears, is it supposed to be quiet and smooth or is a little clicking noise between gears during shifting normal!?
     
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  3. Doealex

    Doealex Medium Load Member

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    Feb 21, 2018
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    I-shift supposed to be changing gears quietly and smoothly. Clicking and noise are signs of the problem. Next thing you will notice that some gears will start making excessive noise constantly while driving (not just changing into gears). Had my transmission replaced by the dealership under warranty few years ago.
     
  4. Mvolvo2011

    Mvolvo2011 Bobtail Member

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    Aug 6, 2020
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    I just changed trans oil and filter and it’s gotten much better but still sticks in gears here and there... was told it could possibly be improper pressure in trans from air and or oil... any suggestions to avoid a costly trans replacement!!!??
     
  5. Mr Bob

    Mr Bob Light Load Member

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    Mar 17, 2015
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    you will need to get it scanned. any codes? does your brake pedal come all the way up?
     
  6. Mvolvo2011

    Mvolvo2011 Bobtail Member

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    Aug 6, 2020
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    Yes brake pedal comes up all the way and no codes at all
     
  7. Mr Bob

    Mr Bob Light Load Member

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    Mar 17, 2015
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    Scantool may be able to do some dynamic testing.
     
  8. Mvolvo2011

    Mvolvo2011 Bobtail Member

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    Aug 6, 2020
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    Who has scantool in southside of Chicago, like oak lawn Illinois alsip Illinois, can anyone refer a reliable knowledgeable honest mechanic in that area that i can take my truck to?
     
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