I have a 06 Tahoe and the lift gate has been opening on its on at different times for example today I unlocked the doors and it opened.

 

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I'm sorry to hear of your frustration with your Tahoe lift gate. It may be your lift gate actuator. This is just a suggestion, not a diagnosis. I encourage you to take the vehicle in for an inspection. They should be able to offer an accurate diagnosis with a physical inspection. Keep us posted.

If you have any additional questions, feel free to contact me.

Have a great day!

Louis
GM Customer Service