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Thread: L99 PCM to LT4

  1. #1
    Carb and Points!
    Join Date
    Dec 2014
    Age
    57
    Posts
    2

    L99 PCM to LT4

    I bricked the PCM of my 1996 Corvette LT4. Bought remanufactured PCM and got one from 1996 Impala L99 4.3L. Same part number as LT4 PCM.

    I tried to flash my Vette calibration file and operating system using JET DST to the new PCM, option Force full program enabled. Flash aborted: "The calibration is not correct for this vehicle".

    Managed to import Vette calibration data to the L99 file and then flash this .jcl to the PCM. I guess I now have L99 operating sytem with LT4 calibration.

    Is the operating system on L99 box different from LT4 box? Am I good to go or should I take the box to dealer for updating the operating system?

    Greetings from Finland

    /lane

  2. #2
    Fuel Injected! roughneck427's Avatar
    Join Date
    May 2012
    Location
    Fresno CA
    Age
    48
    Posts
    271
    Use the PCM recovery option and your LT4 calibration. I've had that error pop up before and either I changed the vin to match or used the recovery option.

  3. #3
    Carb and Points!
    Join Date
    Dec 2014
    Age
    57
    Posts
    2
    PCM recovery option resulted the very same error:
    "The calibration is not correct for this vehicle".

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