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Thread: Checksum Fail Fix

  1. #1
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    Default Checksum Fail Fix

    Is there still a checksum fail fix on V8 for LBZ E35A ECU's? I've used B9999 Checksum Fail Fix 2 on my E38 ECU awhile back but that was with V7.5. I had to use it on my E38 because I pulled the tune off my truck and it had a diablo tune on it. Truck was no start till I used B9999. I worked with Ross back then to get it figured out and I was able to fix the tune with the Checksum Fail Fix. I pulled a tune off my 06 LBZ yesterday for the first time, thinking it was still a stock tune... it wasn't. Now I have the same issue with my LBZ. I'm not seeing B9999 anymore. Is there still a fix for this? I attached the tune.
    Attached Files Attached Files

  2. #2
    Lifetime Member GMPX's Avatar
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    Default

    That was only for certain petrol ECM's, not the Bosch Diesel ECM's.
    I see you have a support ticket, I'll deal with you via that.
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
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    Thanks!

  4. #4
    Lifetime Member GMPX's Avatar
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    I had a look in my E35A folder for a known good file for you to recover this ECM but I cannot find a suitable match I'm afraid.
    Does anyone on here have a stock file they could please attach, here's the segments....

    Boot Software 12604140
    Main Operating System 12604138
    Speedometer 12604118
    System 12604106
    Fuel System 12604104
    Engine Diagnostic 12604099
    Engine Operation 12604098
    Engine 12604113
    Secondary Operating System 12604139

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  5. #5
    Lifetime Member GMC-2002-Dmax's Avatar
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    Here is a clean file, exact match
    Attached Files Attached Files
    Last edited by GMC-2002-Dmax; February 5th, 2021 at 02:58 AM.
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  6. #6
    Lifetime Member GMC-2002-Dmax's Avatar
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    I uploaded the exact file you need.

    This is the last updated file by GM released correct for that original OS.
    Attached Files Attached Files
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  7. #7
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    Thanks GMC-2002-Dmax! Do I just cal flash this tune or do I need to do a full flash? Also, I hear people talk about updating vin numbers in their tunes. Is that something that is necessary too or no?

  8. #8
    Lifetime Member GMC-2002-Dmax's Avatar
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    Full flash, those are 100% stock files
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


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