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Thread: Holden / Pontiac TCM Checksum errors

  1. #1
    Member bK's Avatar
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    Exclamation Holden / Pontiac TCM Checksum errors

    I've just started working on a VZ Clubsport LS2, T42. Just got thrown by this error message which I've never seen before tuning with Flashscan. Going through the normal procedures > IGINTION ON > click READ CALIBRATION DATA > select T42 CONTROLLER > click CHECK STATUS (result OK) > click START.

    Once Flashscan has completed reading the T42 and after the 15 seconds countdown has finished, this message appears:



    Looking in EFILive tune screen you can see the checksum errors:



    So I click on the UPDATE CHECKSUMS and get this lovely message:


    I've read the PLEASE NOTE and sounds exactly right for my situation but not seeing this error before and not seeing any mention on the forum I thought I would post to ensure it's fine for me to UPDATE CHECKSUMS.

    Cheers,
    Brett
    Chassis by Holden
    Engine by Chev
    PCM modified by Flashscan
    Cam by Comp Cams

  2. #2
    EFILive Developer Site Admin Blacky's Avatar
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    The Holden T42 calibrations checksums are wrong from the factory - we don't know why.
    Yes it is fine to correct them, in fact you MUST correct them or EFILive won't let you flash the TCM.

    Regards
    Paul
    Before asking for help, please read this.

  3. #3
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    Another instance of GM being weird, huh?
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  4. #4
    Member bK's Avatar
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    Thanks for that, I was 99.9% sure that was the case.
    Chassis by Holden
    Engine by Chev
    PCM modified by Flashscan
    Cam by Comp Cams

  5. #5
    Lifetime Member Tre-Cool's Avatar
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    Someone needs to run a spell checker through those bits of the code me thinks.

    DO NOT PRECEDED WITH OPERATION.

    incorrect and/or disbaled checksums.

    :lol:

  6. #6
    EFILive Developer Site Admin Blacky's Avatar
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    Quote Originally Posted by Tre-Cool
    Someone needs to run a spell checker through those bits of the code me thinks.

    DO NOT PRECEDED WITH OPERATION.

    incorrect and/or disbaled checksums.

    :lol:
    Doh!
    Before asking for help, please read this.

  7. #7
    Lifetime Member GMPX's Avatar
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    Wow Paul, when did you type that one up?, 3am after some Jack and Coke?

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

  8. #8
    EFILive Developer Site Admin Blacky's Avatar
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    Quote Originally Posted by GMPX
    Wow Paul, when did you type that one up?, 3am after some Jack and Coke?

    Cheers,
    Ross
    I'm beginning to wonder... But you know what they say, you can program or you can spell, but you can't do both.
    Before asking for help, please read this.

  9. #9
    Lifetime Member GMPX's Avatar
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    You don't need to know how to spell to program CPU's, but nothing is written in English anyway. People in the 'real world' just don't get it when you get change from a shop and you complain about a divide by zero error.

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

  10. #10

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    does the checksum really matter? I just did a 99 vette tuned by a known tuner a few years ago and they disabled the checksum because they rewrote a 411 to run non DBW. I actually had to read it with other software and force a 896 file into it before efilive would even get past the bootloader. efilive kept telling me the bootloader was locked but it was'nt. now the pcm is happy. one thing that did come out of it was every time the battery went dead the car would not start until it was sent to the tuner that origonally tampered with the pcm. so the question will an incorrect checksum stop a car from running?
    Dana
    04 kids ages 5-8-13-17 mabye more? hope not!
    03 toy box's 300+ rwh toys in each
    01 wife with 07 TBSS LS2 6.0 my pmt.
    01 pretty nice house my wife wanted.

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