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Thread: Locked 98 vortec PCM?

  1. #1
    Carb and Points!
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    May 2021
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    Locked 98 vortec PCM?

    Hey guys!



    So ive made a bench harness for this 98 vortec PCM that im trying to reporgram. I got the OBD2 port wired in and all that but when I go to read the PCM with LS droid it says its locked? it says "failed to unlock PCM trying again in 3 seconds" is there a way around this or am I screwed and stuck with a GM PCM I bought.

    please help


    thanks

  2. #2
    Fuel Injected!
    Join Date
    Nov 2019
    Location
    Bossier City, Louisiana
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    Hello,

    Is this a red / blue connector P01 PCM? Go to You Tube and search for "locked P01 PCM".

    https://www.youtube.com/watch?v=oGeMK6LvQck&t=22s

    Or, you could look right here Gearhead EFI . . . recent post . . .

    http://www.gearhead-efi.com/Fuel-Inj...p?9829-A-Brick

    Rick
    1970 Chevy El Camino, LM7 Engine, 4L60E - Two 896 and two 0411 PCM's

  3. #3
    Fuel Injected!
    Join Date
    Apr 2017
    Posts
    233
    Its a 4 connector black box pcm. I know little about LS Droid but I'd guess it's not supported for read/write.

  4. #4
    Fuel Injected! trlrider's Avatar
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    Geronimo, TX (Guadalupe County)
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    You would be better of doing a conversion to a 0411. The Black Box's have no to minimal support and very limited in what you can do with them.
    Repinning your harness to the newer and more versatile 0411 - win win!
    Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
    Geronimo, Guadalupe County, Texas
    1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
    2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending

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