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Thread: ECM Lock and unlock

  1. #1
    Junior Member
    Join Date
    Oct 2007

    Default ECM Lock and unlock

    Does GM have a lock on any ECM's from the factory? I have one showing locked.

  2. #2
    Lifetime Member
    Join Date
    Mar 2006


    Yes, all ECMs are locked from GM. EFILive has to crack this code in order to send the bootloader to the ECM so it can be read/flashed. Now if EFILive cant crack this one, sounds like someone else has changed the lock code and either you need to know what it is in EFILive, or have that person unlock it for you. I dont think EFILive can unlock HPT locks and vice-versa.
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  3. #3
    EFILive Developer Site Admin Blacky's Avatar
    Join Date
    Mar 2003


    Our latest pre-release software has an option that tries 2 additional GM keys. Sometimes (but rarely) controllers can get sent into the field with the keys set to "production line" settings. EFILive now allows you to "try" those keys as well. To try them, use the option "Try Alt Keys" in the PCM locking window.

    But what Erik said about the locking is all true. We can't unlock any other tuners' locked controllers and they can't unlock ours. (unless you remove/replace the flash chip).

    Before asking for help, please read this.

  4. #4
    Junior Member
    Join Date
    Oct 2007

    Default Ecm Lock

    Will tech II reset lock so efi can unlock it?

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