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Thread: L31 OS Change

  1. #1
    Join Date
    Mar 2012

    Default L31 OS Change

    I know I have don't it before but now I get a message saying I have 2 different OS's. Anyway to flash a new OS now on the L31?

  2. #2
    Lifetime Member
    Join Date
    Aug 2010


    L31 5.7L used the Blackbox Vortec PCM from 1996 to 2000 - believe these are cal flash only (i.e cannot change the OS) with EFILive.

    The 2001 and 2002 L31 used an LS1-B PCM - so you should have no problem changing the OS with one of these.

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