Transmission fill plug

Discussion in 'Gen 5 Prius Main Forum' started by Shawn Shawn, Feb 2, 2026 at 12:58 PM.

  1. Shawn Shawn

    Shawn Shawn New Member

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    Hi everyone — quick question: can someone confirm where the transmission fill plug is located and, if possible, share a photo of it?


    I’m trying to verify whether the plug I’m looking at is the transmission fluid fill plug (or if it’s actually a fuel plug / something else). Thanks!
     

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  2. Mendel Leisk

    Mendel Leisk MMX GEN III

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    From reading through attached, looks like fill and drain bolts for the transaxle are socket head cap screw style (female), with recess for 10 mm hex driver. Info:
     

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  3. BiomedO1

    BiomedO1 Senior Member

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    Nice bolt head - how about a zoom out picture so we can get an idea of the location of that bolt?
    FWIW; the fill plug is next the output CV shaft.
     
    #3 BiomedO1, Feb 4, 2026 at 9:58 PM
    Last edited: Feb 5, 2026 at 12:57 AM
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  4. Georgina Rudkus

    Georgina Rudkus Senior Member

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    TE means that the transaxle uses TE fluid.

    Evidently, the drain plug was upgraded on the OP's vehicle to make sure that the technician knows that the transaxle uses TE fluid and not the previously used WS fluid in earlier models.
     
    #4 Georgina Rudkus, Feb 4, 2026 at 10:01 PM
    Last edited: Feb 5, 2026 at 12:57 AM
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  5. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Here’s a screen grab from my previous attachment, showing fill and drain bolt locations. No mention, but the views are apparently different, so seems like the two bolts are not on the same face.

    IMG_3185.jpeg

    typical terse/cryptic Toyota repair manual style btw. :rolleyes:
     
    #5 Mendel Leisk, Feb 5, 2026 at 10:09 AM
    Last edited: Feb 5, 2026 at 11:11 AM
  6. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Sorry for the confusion.

    I meant fill plug. The drain plug is the one with the 10mm hex socket.

    The plug marked TE is apparently the fill plug.

    Both, however, are still an M18x1.5 thread pitch.

    If it was my car, I would replace t h e drain plug with a widely available M18x1.5 aluminum magnetic drain plug.