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Thread: 2001 os 12208322 to 2002 os 12212156 not working

  1. 10-17-2015 #1
    rlk1071
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    2001 os 12208322 to 2002 os 12212156 not working

    Got a 2001 Silverado pcm with a 12208322 os (6.0 4l60E tune)and did a write entire to install 2002 Silverado 12212156 os (6.0 4l80E tune)and engine will not start. I am assuming that this computer can't run this os!?!?!? Any help would be appreciated, Thanks
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  2. 10-17-2015 #2
    mecanicman
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    Computer can run it just fine. Disable or learn the VATS.
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  3. 10-18-2015 #3
    rlk1071
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    Was hoping it was that simple, and you were correct VATS was still on. THANKS!!!!
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  4. 06-02-2018 #4
    Overburban
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    I see this is an old thread, but anyway I can get a copy of 12212156 stock tune. The tune repository is down and this is same OS I need for a segment swap.
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