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  1. #4
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    Feb 2019
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    I know this thread is old but I'm in dire trouble. I am working on a 2010 Chevy 2500 6.0L vin 1GC4KXBG3AF147376 OS:12636005.
    I made a copy of the original tune. Then disabled the downstream O2s in the DTC type n mil. When I did the full flash, at the very end I got the checksum fail $06FF. Now the truck will not start
    Nothing I do allows me to flash the computer and now 7.5 scan won't recognize the E38. There is no checksum fail parameter.
    Where do I find the checksum patch or how do I fix this. Thanks
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