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  1. I

    6L80 issue

    SUCCESS! After several delays for weather, work and more weather we rolled the dice. They came up tear down and clean the throttle body. we took it apart one piece at a time and cleaned and reassembled. Several ov the valves were “sticky” but nothing excessive. More work and weather delays...
  2. I

    6L80 issue

    We installed the TCM and had it towed to the dealer. This dealer would only do the program. Then said we had connected something wrong, can you get it towed out of here ASAP. Even tried to charge $35 for a “hazardous material disposal fee”. Took almost an hour to get the fee taken off after...
  3. I

    6L80 issue

    The popping sound you heard was my head popping out of my …. It’s an 07
  4. I

    6L80 issue

    Wow! Thanks and thanks again. That is infinitely more knowledge than I received from any shop. we really appreciate the time you spent analyzing our issues. We are expecting warmer weather (South Mississippi) this week and we will put your suggestions to work. I‘ll keep you updated or our...
  5. I

    6L80 issue

    Does the TCM need a “relearn” after programming? The dealer only did a “programing”. I didn’t get a real warm feeling after dealing with the GMC dealership but I don’t know enough to say they did not program it correctly. Had to give the old TCM up as a “core”.
  6. I

    6L80 issue

    I think that would be a good option. But we want to make sure it’s the transmission first (if we can).
  7. I

    6L80 issue

    P0700 transmission control system (MIL request) and P0777 Solenoid B Stuck on.
  8. I

    6L80 issue

    I tried to post this in the 6L80 thread but could not. my son has an 06 Yukon Denali AWD with the 6L80 transmission (200,000+ miles) I’ll try to keep this brief. His issues started with the transmission “going into neutral“ while he was driving. Not literally but it would just go out of gear...

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