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Thread: 4l60e lost 4th and tcc

  1. #1
    Potential Tuner cambridgeratrod's Avatar
    Join Date
    Sep 2015
    Location
    Cambridge Ontario Canada
    Posts
    7

    4l60e lost 4th and tcc

    1999 4.8l and 4l60e
    A few weeks ago I had to repair the vss wiring but since then the pcm will not enable 4th gear or tcc.
    I can manually actuate them with the scanner.
    I have no codes stored and have also tried a reflash.
    There must be a parameter the pcm is looking for but I just cant seem to find it.
    All appears well in the datastream but just looking for a couple ideas to check.
    thanks
    Last edited by cambridgeratrod; 11-08-2015 at 08:15 AM.

  2. #2
    Potential Tuner
    Join Date
    Sep 2020
    Posts
    5
    Did you ever find out what was wrong ? i have one that wont shift into 4th.