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Thread: T43 new programming

  1. 03-15-2023 #1
    roysatikas
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    T43 new programming

    May be purchasing a new T43 (don?t have the part number just yet as I have not removed it yet) for a 2007 Yukon 6.2/6L80E
    If the new TCM is cleared of its previous tune am I able to plug my trans harness into it and flash my current trans tune from the HPT editor?(trans write entire)

    May have some failing pressure switches/solenoids in the current T43

    I rebuilt the pressure switches and electrically tested the TCM during my rebuild process but having some slipping/flaring
    1-2/2-3 when the trans temp is 190 degrees. No issues cold temp and I have a cooler.

    Eng/trans combo in a 91 Camaro

    Thanks
    .
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  2. 03-16-2023 #2
    TheMechanic
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    If the trans has been programmed correctly with SPS/TechLine Connect then you should have no problem loading in your old settings into the new TCM
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  3. 03-16-2023 #3
    Alvin
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    I've not had any issues writing entire T43's. They don't have to be SPSed. In my experience anyway.
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  4. 03-16-2023 #4
    blindsquirrel
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    Others have said that a new-new T43 needs the initial programming done in SPS, like a bootloader or something needs to be in place first. After that the entire OS can be changed with write-entire. A reman-new isn't as blank as new-new. At least that's the internet version of how it works, don't know first hand.
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  5. 03-16-2023 #5
    TheMechanic
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    Quote Originally Posted by blindsquirrel View Post
    Others have said that a new-new T43 needs the initial programming done in SPS, like a bootloader or something needs to be in place first. After that the entire OS can be changed with write-entire. A reman-new isn't as blank as new-new. At least that's the internet version of how it works, don't know first hand.
    I know first hand. I'll get reman/new modules with all kinds of OS's. I never take the chance of something screwing me up. Along with that GM and their constant software updates will often fix issues that I can't even see in a compare feature between pre-read and post read. I know stuff has been changed and often times I can feel the change but HP tuners AND EFI Live does not pick it up.
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  6. 03-16-2023 #6
    Alvin
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    Its likely the best idea to use SPS.. but I guess my point was it isn't like a GEN 4 ECM where it flat out won't work to flash different OS's.
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  7. 05-09-2023 #7
    roysatikas
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    Sorry for the late reply
    Thank you everyone
    I will post results when all back together
    Roy
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