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Thread: E92 2015 Tahoe L83 mated to a 2008 6L90E NO start

  1. #1

    Default E92 2015 Tahoe L83 mated to a 2008 6L90E NO start

    I have installed a 2015 tahoe engine mated to a 2008 6L90E from a silverado. I have tried to get this thing to run for a while now. I have played with VATS, Stater relay, Fuel pressure sensor and forget what else. I have never seen the injectors be activated or commanded ON at any point of this process. I have had to take a break from it out of frustration. Can it be that the T43 needs to be reprogrammed for a 2015 Tahoe? Or if there are any other ideas that people may have on this it could be helpful.

    Thank you
    Just one guy tryin' to make a difference

  2. #2
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    I don't think the ecm and tcm will communicate properly. Do you have a DTC for that? I don't think that's the no start issue though. Can you post a copy of the tune file?
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  3. #3
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    +1 the ECM and TCM are mismatched years, the protocols don't match.

    ~ posted by phone ~

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