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  1. #1

    Default 97 express 5l ecm replacement

    got a 97 5l express that my scan tool cant see the ecm and no fuel no spark.
    Rreplaced all fuses and relays to no avail

    if i replace my ecm with a used one from the same year and engine will it start right up????

    or do i have to reflash/reprogram it????

    my truck does not have a chip in the key and doesnt have antitheft

  2. #2


    I think you still have to get it flashed, but its been awhile since i did a used ECM

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

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