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Thread: are M5 and M3 TCM(transm Control Module) compatible?

  1. #1
    Registered Member

    2008 mazda 5

    Join Date
    Apr 2017
    near L.A.

    are M5 and M3 TCM(transm Control Module) compatible?

    pulled the TCM from my 08 Mazda 5, wanted to get a used one from ebay, seems there're a lot more TCM for M3 than for M5. wondering if they're compatible. I think the two models have the same engine/AT ?

    my TCM is L39C 18 9E1B
    I think the M3 TCM starts with L34T 18 9 *

  2. #2
    Registered Member

    2005 Elise LSS

    Join Date
    Feb 2019

    are M5 and M3 TCMtransm Control Module compatible

    Some times our mods are no better than the engineers that designed the engine. In fact a lot of mods actually do more harm than good. What are you dong to the engine and what mods have you done?

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