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Thread: Checksum Fail on full flash no B9999 param

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    Feb 2019
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    Default Checksum Fail on full flash no B9999 param

    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 B9999.
    Where do I find the checksum patch or how do I fix this. Thanks
    Attached Files Attached Files
    LS3 Manual 6 spd E38 os:12633056
    Texas Speed 1 7/8" headers w/3" exhaust
    Texas Speed cam 229/236 .629/.615 112 LSA
    Hi-Ram intake stock injectors 90mmTB

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