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Thread: TCM Flash - NOW TRUCK WON'T START - HELP

  1. #1
    Junior Member
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    Default TCM Flash - NOW TRUCK WON'T START - HELP

    I have a 2005 LLY /5spd Alli. This is my first use of EFILive. I uploaded the TCM successfully. I changd the max shift defuel to from 89% to 50%. I flashed the 5spd Ali TCM back into the truck. Now it won't start.

    The TCM flash said it was successfull. I don;t have any errors or tr0uble lights.

    Can someone please help me get my truck running again!

    Thanks.

  2. #2
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    Flash the original tune file into the TCM and see if the problem goes away.

  3. #3
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    I tried that right away. No luck.
    I also took the battery cables off for a few minutes, No Luck.
    I tried a Vats relink, no Luck.
    I set the Vats to disable in the PCM, No Luck.

  4. #4
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    Does the engine crank/turn over?
    Did you change the Vin that's stored in the TCM?
    Did you check the stored vin against your trucks vin?
    To change the vin, open the scan tool, select the proper controller, then at the top of the page click on Bidirectional>Change Vin and enter the proper vin.
    Last edited by LReiff; September 2nd, 2011 at 11:42 AM.

  5. #5
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    Yes the engine cranks, it just won't fire.
    I just checked th vin and it matches the truck as well as the PCM.

    One wierd thing, Even though it was showing the correct vin, I tried to use scan tool to reset the vin as explained, but it failed with "Security Access Denied"?

  6. #6
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    Thanks for the help so far!

  7. #7
    Lifetime Member GMPX's Avatar
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    I can't think why the engine would not run after a TCM flash, can you read the ECM?
    I no longer monitor the forum, please either post your question or create a support ticket.

  8. #8
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    Yep I backed up both before starting the whole process. I can read and write both without errors.

    I can't think of any scan tool pids to watch to see why it won't start. It's got to be something with the Vat.

  9. #9
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    I'm trying the whole Vat relearn timer thing now. 15 min key on for 3 cycles. I can't think of anything else to try?

  10. #10
    Lifetime Member ChipsByAl's Avatar
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    Do you have any DTC's
    AL
    "Trash that carb and get Injected!"

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