Results 1 to 1 of 1

Thread: Checksum Fail on full flash no B9999 param

  1. #1
    Join Date
    Feb 2019

    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

Similar Threads

  1. Checksum Fail Fix
    By Nick Fly in forum General (Diesel)
    Replies: 7
    Last Post: February 7th, 2021, 10:46 AM
  2. Replies: 6
    Last Post: November 8th, 2015, 05:02 PM
  3. 03 ss truck flash fail
    By 69camaro5speed in forum Gen III V8 Specific
    Replies: 14
    Last Post: July 26th, 2015, 11:19 AM
  4. Not showing file analysis - B9999 OK to flash?
    By jqc99 in forum Cummins 5.9L
    Replies: 26
    Last Post: August 26th, 2013, 02:29 AM
  5. Pre Full Flash to Full Flash Tune Question
    By Donovan in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 1
    Last Post: January 13th, 2010, 11:43 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts