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  1. #1
    Senior Member
    Join Date
    May 2009
    Posts
    192

    Exclamation VIN Change Not Updating

    So when I change the VIN (either in v.75 or Tune Tool Properties) the original VIN is still showing in the TCM when I perform an F2: Read. I have done a Cal Flash, Full Flash and a Flash in V2. It doesn't matter. As soon as I pull the calibration the original VIN shows up again in the TCM. It even shows the original VIN in the V.5 "Show PCM Info" pop up.

    Software and Firmware are up to date. Any ideas? Is this some new GM witchcraft to keep the original VIN locked in the TCM?
    Last edited by TBMSport; November 26th, 2019 at 11:38 AM.
    Trailblazer "RS" 5.3L 6L80 4x4 & '07 TBSS LS2 6L90 AWD

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