Liftgate will not electrically open or close

My 2007 Denali has a power liftgate that simply quit working. It makes noise like it wants to open, but it no longer opens or closes under power. I have checked all connections, fuses and mechanical parts. It appears the problem might be the motor isn't being actuated (since it doesn't move by its own power) or the electric latch is refusing to unlock and tripping the interrupt and shutting the process down. I doubt its the latter since I disconnected the mechanical arm and did some tests and it still doesn't work. Could it be the electric latch or perhaps the motor is bad?

Yes, it unlocks manually using the outside handle when the toggle switch on the dash is pushed to manual only mode. With the remote, it makes noise and comes open a small bit, but does not want to open without shutting it again and opening manually with the outside handle.

It's out of warranty so didn't take it to the dealer yet. I assume that's the only way to scan for BCM codes? If I take it to the dealer, I'll probably just have them fix it since its there, but was hoping to avoid a costly trip to the dealer.

I have a 2007 Yukon I was having the same trouble. I found that the switch above the rear view mirror was turned off. I turned the switch back on and everything started working fine. Hope this helps you out. Jdh55

The rear hatch keeps unlocking by itself at no particular time. Door works fine but won't operate remotely or when auto-close button is pushed because the hatch keeps unlocking

Check the Open/Off Switch

This happened on 10-26-2019. Wedding Dance. Someone else designated driving my 2013 Suburban to the hotel at midnight. Passenger needed a dome light and accidentily turned off the switch on the upper console for the liftgate. Unknown to me, I thought the gate was broke. Turns out a few folks on here said to check the switch (I forgot it even existed). Go check your switch first. Mike McCann cost: I ain't telling my wife.

You can also check the hatch window! I have a 2007 Yukon and if you’ve accidentally pushed the button on the key fob and it’s opened the hatch won’t unlock.