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About TBL569

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    2019 AT4
  1. There is a service bulletin on the 8sp transmissions for your issue. I had a 17 HC with this and I had it serviced several times for this issue. It drove me crazy until I finally traded it in. There is no fix but they may do a relearn on yours like they did on mine. It helped for a few weeks but returned to the normal harsh shift between 1 and 2 upon the first start up if the day. Unfortunately they told me that the transmission was "operating as designed". If you keep your truck look into an aftermarket tuner.
  2. Serice Steering Column Lock

    500 on my AT4 and I have this also. It only comes on when I use the onstar app to autostart it. I have an appointment at the dealer to have it checked out next week. If there is no fix yet it still needs to be documented.

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