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2022 T680 Transmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by moybutter, Jun 20, 2025.

  1. Jun 20, 2025 #1
    moybutter

    moybutter Bobtail Member

    35
    25
    Jul 16, 2018
    0
    For the first time since I've been driving this truck it wouldn't accelerate when I hit the pedal and then a little while later it accelerated but it was stuck in 9th gear.
    I pulled over and removed the transmission fluid reservoir cap and I did not see any fluid and smoke was coming out of the hole.
    When I resumed driving a little while later the truck accelerated and the gears shifted normally.
    Am I low on transmission fluid? There is no dipstick on the cap I did not see any fluid leaks on my pre trip. Thx
     
    moybutter, Jun 20, 2025
    moybutter, Jun 20, 2025
    #1
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  3. Jun 21, 2025 #2
    mitrucker

    mitrucker Road Train Member

    5,228
    9,212
    Dec 15, 2010
    Lapeer, MI
    0
    Most likely an electronic issue.
     
    mitrucker, Jun 21, 2025
    mitrucker, Jun 21, 2025
    #2
  4. Jun 21, 2025 #3
    engine_900

    engine_900 Bobtail Member

    20
    22
    Jul 16, 2021
    Vancouver, BC
    0
    how many miles on the transmission box? Try replacing the tranny fluid first since its the least expensive and most common cause.
     
    engine_900, Jun 21, 2025
    engine_900, Jun 21, 2025
    #3
    moybutter Thanks this.
  5. Jun 21, 2025 #4
    AModelCat

    AModelCat Road Train Member

    29,139
    158,319
    Jul 7, 2015
    Canuckistan
    0
    Most of these automatics are just automated manuals. Changing the oil isn't going to do much, it's not like they're a true automatic with clutches, bands and a torque converter.
     
    AModelCat, Jun 21, 2025
    AModelCat, Jun 21, 2025
    #4
  7. Jun 21, 2025 #5
    OlegMel

    OlegMel Medium Load Member

    386
    681
    Apr 8, 2023
    0
    There should be a sight glass on side of the transmission to check fluid . Try disconnecting batteries for 30 minutes, sometimes you’ll get a ghost code or some random bs code that will trip the computer.
     
    OlegMel, Jun 21, 2025
    OlegMel, Jun 21, 2025
    #5
  8. Jun 24, 2025 #6
    Lazer

    Lazer Road Train Member

    1,789
    2,839
    Jan 22, 2017
    0
    Check your alternator for funky ‘charge spikes’ that can raise all sorts of havoc with auto-shift transmissions.
     
    Lazer, Jun 24, 2025
    Lazer, Jun 24, 2025
    #6
    moybutter Thanks this.
  9. Jun 26, 2025 #7
    moybutter

    moybutter Bobtail Member

    35
    25
    Jul 16, 2018
    0
     
    moybutter, Jun 26, 2025
    moybutter, Jun 26, 2025
    #7
  10. Jun 26, 2025 #8
    moybutter

    moybutter Bobtail Member

    35
    25
    Jul 16, 2018
    0
    I have approx 362k miles on the truck and I am a company driver. I haven't had a repeat of the issue so I believe that it was just an electronic glitch as someone previously mentioned.
     
    moybutter, Jun 26, 2025
    moybutter, Jun 26, 2025
    #8
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