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Thread: Pcm Unlocking

  1. #11
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    quick question:
    If you are going to use a new EFILive tune or custom OS... wouldn't it be easier to reinstall new software over the locked program? Or, am I misunderstanding and it is the PCM's access that is locked?
    On the few "locked mail order tunned" PCM's that I have redone I have had no problem with reinstalling a current version of GM software and starting over with 'clean' un-piddled with software.
    I'm old and Retired! I used to go fast. I don't go so fast anymore ...but, my cars still do!

  2. #12
    Joe (Moderator) joecar's Avatar
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    Maggie, you're correct: the lock only prevents reading, it doesn't prevent overwriting.

  3. #13
    Junior Member carneb's Avatar
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    Quote Originally Posted by joecar
    Maggie, you're correct: the lock only prevents reading, it doesn't prevent overwriting.
    Does that mean that no matter what method is used to lock the PCM, you can still overwrite it?

  4. #14
    EFILive Reseller ringram's Avatar
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    Oh ok, I missunderstood. In which case thats fine. Im happy with being able to overwrite the whole thing with a full reflash.
    As carneb says, can someone confirm this 100%. I cant test on mine as I have the road runner PCM which works differently.
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  5. #15
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    If the locking alters the seed key, then how can it be overwritten?

    Ryan

  6. #16
    EFILive Reseller ringram's Avatar
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    Write a new seed over the top. Dont try and read anything, just write is my guess
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  7. #17
    EFILive Reseller wait4me's Avatar
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    IF the pcm is locked you cant read or write to the pcm.
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  8. #18
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by wait4me
    IF the pcm is locked you cant read or write to the pcm.
    Oh, you can't even write over the top...?

  9. #19
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by joecar
    Oh, you can't even write over the top...?
    So what do you do if if have a locked PCM and want to overwrite it with your own tune...?

    Edit: hmmm.... I remember a very old thread dealing with this...

  10. #20
    EFILive Reseller wait4me's Avatar
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    The only options are for you to pull the computer apart, Make a brute force password program, get a new computer, or get the person that unlocked it to either unlock it for you, or give you the key.
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

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