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Thread: 10L90 Trans Tune

  1. #1
    Potential Tuner
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    Mar 2025
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    10L90 Trans Tune

    I have a 2021 Camaro ZL1. Just got my car back from a reputable tuning shop with some new mods and a trans tune. I have my own MPV3 that they used to tune a couple vehicles for me. A trans tune was supposed to be done as well while there and they stated it was done, unlocked in house and tuned with my device. I hooked up my laptop today to read the tunes to learn from the changes made due to being a beginner and wanting to learn how to tune. I tried to read the TCM and got an error message. Was I lied to about the trans tune or what? I am not going to name the tuning shop as of yet until I figure out what the deal is. I am attaching a screenshot of the error



    IMG_0162.jpg

  2. #2
    They didn't lie. T87A and T93 modules are WRITE only modules from HP Tuners. If the module was still locked, you would've gotten a message stating the module requires an unlock service.

    You aren't able to see what changes ANYONE has made to that module since they're write only. You will always be given a stock tune message like this from HP Tuners when you read one of these modules. If you were the one tuning it from the beginning, you would be working off your revisions off a SAVED FILE that were made opposed to reading out the module every time.

  3. #3
    Potential Tuner
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    Mar 2025
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    Quote Originally Posted by relicdew View Post
    They didn't lie. T87A and T93 modules are WRITE only modules from HP Tuners. If the module was still locked, you would've gotten a message stating the module requires an unlock service.

    You aren't able to see what changes ANYONE has made to that module since they're write only. You will always be given a stock tune message like this from HP Tuners when you read one of these modules. If you were the one tuning it from the beginning, you would be working off your revisions off a SAVED FILE that were made opposed to reading out the module every time.
    That makes sense. I was getting the tcm unlock message before it went to the tuner. Thanks for the insight!