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Thread: "New" A40 TCM compatible with locked ECU tunes

  1. #1
    New Member
    Join Date
    Jan 2023

    Default "New" A40 TCM compatible with locked ECU tunes

    Hey guys, Quick question here. Have an LMM with locked tunes from Danville. Begged for the code just to be able to adjust some things for driveability in the TCM. Mainly part throttle upshifts and lock/unlock points. Understandably they refuse to let the code out so I am stuck with what I have.

    My main question is if I reflash or "write my own" tcu tune, will it be able to work correctly with locked ecu tunes?,

  2. #2
    EFILive Developer Site Admin Blacky's Avatar
    Join Date
    Mar 2003


    The ECM and TCM are locked/secured independently. The locking only prevents reading/flashing - it has no effect on the operation of the ECM/TCM.
    if one or the other is locked it won't affect the interoperability of either.
    So if your ECM is locked and your TCM is not then you can edit/flash the TCM and will will continue to work with the ECM.

    Before asking for help, please read this.

  3. #3
    New Member
    Join Date
    Jan 2023


    Awesome, thank you paul!

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