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Thread: 4l80e shifts won't shift until redline

  1. #11
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    Just pulled a p0706 trans code. Related?

  2. #12
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    From memory DTC P0706 relates to the transmission mounted Gear Position (Park-Neutral) Switch used by Trucks and Corvettes.

  3. #13
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    Does it affect shifting or indicate internal problems? Info not have the range selector in the harness.

  4. #14
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    If you are not using a transmission mounted Gear Position Switch, then the tune needs to be adjusted accordingly - as the PCM is not receiving these inputs.

    When you get your shift speeds sanitized post your tune again. I can turn off the Gear Position Switch for you - I don't think the necessary parameter is available in EFILive.

  5. #15

  6. #16
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    Quote Originally Posted by bubba68ss View Post
    That is a completely different tune than you originally posted in post #3. This one looks like a Corvette tune (from the TuneFileDepot) with 4L80 segments swapped in. The WOT shift speed logic is still backward.

    I have a limited amount of time available to help out on this Forum ... I get a little frustrated when people don't first help themselves by trying everything that they can to make things work ... I'm stepping out of this thread.

  7. #17
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    I was trying to start over with a 12212156 OS (which I have used a lot before) with DBW and simply uploaded the wrong file by mistake. This was the version I had saved after segment swaps and BEFORE I corrected trans shift points. I apologize.

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