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TCM, Transmission Control Module/Computer

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Taco4Eli, Apr 23, 2025 at 10:49 PM.

  1. Apr 23, 2025 at 10:49 PM
    #1
    Taco4Eli

    Taco4Eli [OP] New Member

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    2015 2WD TRD SPORT D/C A/T... Would like to know if someone would please help me with where the TCM is located.
     
  2. Apr 24, 2025 at 4:36 AM
    #2
    Dm93

    Dm93 Test Don't Guess

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    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    There is no TCM just the ECM (Engine Control Module) which also controls the transmission.

    It's located behind the glovebox.

    Why do you ask?
     
  3. Apr 24, 2025 at 8:40 AM
    #3
    Taco4Eli

    Taco4Eli [OP] New Member

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    Experiencing some shutter in drive as the transmission shifts through the gears automatically, do not get it when shifting manually. Already dropped the pan replaced filter cleaned pan and magnets chased old fluid out with 12 qts of fresh WS by disconnecting the trans cooler filled to proper level bringing it to temp w/ scan tool. Strange thing is it worked perfect immediately after the fluid change, then on the following day did an engine oil change and disconnected the battery cleaned terminals and posts applied noco ncp2 and went for a drive and the shutter was back. So was wondering if it could be an electrical issue since this is a flood recovered vehicle and the original ECM was replaced with a used ECM that still has the donor vehicles vin. Next up was going to check all wiring connections for any corrosion. Thanks for helping out!
     
  4. Apr 24, 2025 at 9:09 AM
    #4
    Dm93

    Dm93 Test Don't Guess

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    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    Pretty doubtful it's a module issue, it could be electrical/connections but typically you would get a an associated fault code.

    Disconnecting the battery clears alot of learned adaptives so it's not uncommon for things to operate differently after a battery disconnect until it all relearns, if there was an issue present that was masked by adaptives it would be exaggerated when those adaptives are cleared.

    There's alot of info about the A750 transmission in the thread below by @gearcruncher although alot of the external links are broken/dead.
    He knows quite a bit about auto transmissions and could probably give you some pointers but he doesn't hang out on here much anymore.

    I'm pretty good with the electrical side of things but hydraulics aren't my forte.

    https://www.tacomaworld.com/threads...th-pics-for-second-gen-4-liter-trucks.289913/
     
  5. Apr 24, 2025 at 9:19 AM
    #5
    Taco4Eli

    Taco4Eli [OP] New Member

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    Yes, I have been looking through that thread to see if anything jumps out at me., you are right about there is a lot there, lol.
    Thanks again for the help, I'll keep you posted on any developments.
     
    Dm93 likes this.

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