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Thread: 2020 L5P ECM Locked out

  1. #1
    Potential Tuner
    Join Date
    May 2023
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    3

    2020 L5P ECM Locked out

    Last night I uploaded GDP tunes to my 20 L5P and it went great, everything said it was happy. Unplugged the unlock cable and the truck will not even attempt to start. I tried to get back in and write the stick files to the ECM and it has me locked out. HP tunes software will not even see the ecm. Any pointers on what to do while I wait till Tuesday for everyone to open back up from memorial day?

    Life lesson... DO NOT TUNE ON FRIDAY NIGHTS!!!

  2. #2
    Advanced Tuner
    Join Date
    Aug 2016
    Posts
    386
    Quote Originally Posted by L5p View Post
    Life lesson... DO NOT TUNE ON FRIDAY NIGHTS!!!
    Truth - doubly true for Holiday weekend.

    I would recommend double checking all your connectors are firmly in place, and disconnect / reconnect the battery, and see if that helps.

  3. #3
    Potential Tuner
    Join Date
    May 2023
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    3
    I left the batteries un hooked overnight. Let's see if that helps.

  4. #4
    Potential Tuner
    Join Date
    May 2023
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    3
    ok, sooo after a talk with a tech.. if you have a mess up while uploading you tune reload the stock not in calibration but in entire and you get it right back!