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Transmission fluid mistake

Discussion in '3rd Gen. Tacomas (2016+)' started by TacomaRoy, Sep 14, 2021 at 6:59 PM.

  1. Sep 14, 2021 at 6:59 PM
    #1
    TacomaRoy

    TacomaRoy [OP] Member

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    Hi, I made a mistake doing an all change today. Been working on mycars for 20 years, first time changing my oil on my Tacoma and I managed to drain the transmission fluid instead of oil. Still kicking myself 12 hours later. I measured 3.5 quarts came out. can I just replace 3.5 back in or do I need to go through the temperature checks running at both hot and cold as I've seen in a few YouTube videos? Thank you
     
    tacotoe likes this.
  2. Sep 14, 2021 at 7:03 PM
    #2
    Macsplace

    Macsplace Active Member

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    Do it correctly as the service manual states. How do you know it was actually full before? Dont mess around
     
    Knute likes this.
  3. Sep 14, 2021 at 7:06 PM
    #3
    Grossomotto

    Grossomotto Complete 3rd Member

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    Just put 3.5qts new trans fluid back in

     
  4. Sep 14, 2021 at 7:07 PM
    #4
    dave5623

    dave5623 Well-Known Member

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    Don't you just fill until it dribbles out of the fill port? Assuming its on a level floor
     
  5. Sep 14, 2021 at 7:17 PM
    #5
    Vlady

    Vlady Well-Known Member

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    Put it back in what you drained+some more(just a tip) . I heard 21's cannot be put in temp mode by jumping pins.
    May need to look for a help on a side or a dealer
     
  6. Sep 14, 2021 at 7:18 PM
    #6
    2016Tacoman

    2016Tacoman Well-Known Member

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    The fluids are always the proper level from the factory ! :crapstorm:
     
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  7. Sep 14, 2021 at 7:21 PM
    #7
    cryptolyme

    cryptolyme Well-Known Member

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    can't you just drive the truck until the transmission reaches the correct temperature? btw, what is the correct temperature?
     
  8. Sep 14, 2021 at 7:24 PM
    #8
    splitbolt

    splitbolt Well-Endowed Member

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    Fill at fill hole...
    Needs a dribble at the overflow hole when ATF temp is 95-113 degrees. There is also a drain hole...

    The hardest part, most of the uninitiated seem to complain about, is getting it into temp check mode. It's really not that difficult. I liken it to entering a cheat code on an old NES.
     
    Shellshock likes this.
  9. Sep 14, 2021 at 7:27 PM
    #9
    splitbolt

    splitbolt Well-Endowed Member

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    There's only about a 5-10 minute window when the truck is at idle.
     
  10. Sep 14, 2021 at 7:30 PM
    #10
    TnShooter

    TnShooter Well-Known Member

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    Just put back the 3.5 qts.
    If it ran fine before, you should be fine.
    I think you are probably overthinking this.

    Or, if it makes you feel better.
    Have a dealership check it. That way you know it’s right.
     
    shotgunbilly420 likes this.
  11. Sep 14, 2021 at 7:36 PM
    #11
    Vlady

    Vlady Well-Known Member

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    the rumor is that 21s don't have an ability to jump pins on OBD connector, like previous years. So, you need a techstream or at least some sort of obd2 monitoring app to get a temperature.
    I'm sure a grill thermometer could work, but the issue is with maintaining a proper rpms for temp checking
     
    TacoManOne likes this.
  12. Sep 14, 2021 at 7:39 PM
    #12
    SR-71A

    SR-71A Define "Well-Known Member"

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    That sucks..

    Assuming the fill level was correct from the factory, adding the same exact amount as what came out should be good to go!
     
  13. Sep 14, 2021 at 7:45 PM
    #13
    Vlady

    Vlady Well-Known Member

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    For sure. Nothing is going to break. Just need to adjust a level..
    Need 24 mm socket with 6 conners (don't use 12) to get the fill plug out
     
  14. Sep 14, 2021 at 7:49 PM
    #14
    splitbolt

    splitbolt Well-Endowed Member

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    I thought 'they' figured that out...
    Basically the same procedure, sans the jumper.
     
  15. Sep 14, 2021 at 8:21 PM
    #15
    cryptolyme

    cryptolyme Well-Known Member

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    that's all i need. thanks.

    btw just heat it up to 120 and take your time.
     
  16. Sep 14, 2021 at 9:30 PM
    #16
    mattleg

    mattleg Well-Known Member

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    SR-71A and Smacky2020 like this.
  17. Sep 14, 2021 at 10:23 PM
    #17
    Jeffaz1

    Jeffaz1 Well-Known Member

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    I did the same thing as you did several years ago on my 2006. I have heard of others doing this too. I didn't mess around though and just towed it to the dealer (was a free tow).
     
  18. Sep 14, 2021 at 10:37 PM
    #18
    INSAYN

    INSAYN Well-Known Member

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    Too soon? ;)
     
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  19. Sep 14, 2021 at 11:43 PM
    #19
    Shades_Of_Red

    Shades_Of_Red Well-Known Member

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    A few.
    When its in the correct temperature range
     
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  20. Sep 14, 2021 at 11:53 PM
    #20
    SRBenjamin

    SRBenjamin Well-Known Member

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