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Hello!

Can't open liftgate with a keyfob or from the overhead console. I hear the sound of the running motor (on the lock) and thats it, nothing happens. However, if I open the lock manually and then press the power liftgate button - it works and. *it's not closing (I mean, you have to close the liftgate manually). Taillights are blinking when I press the button.

First of all, I opened the motor.
Discovered several problems.

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As you can see on the right side of the image, the "pinion gear", isn't sitting properly.
It's a little bit up, because, I put gasket under it. I'll explain why - later.

I removed the shaft.

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There is a groove on the top op the shaft. The brass "coil" goes inside the groove. See image 7.

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On the top of the shaft (image 7), you can see a little teeth. Similar to the teeth we find on the metal flap (image 4).

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So, the teeth on the metal flap, suppose to go, in between the teeth of the shaft, to be able to rotate it.
But, as I showed earlier, there is a brass "coil" between them. As a result, teeth of the metal flap aren't in contact with the shaft (I assume, that's why the lock was not opening - it simply didn't rotate).

To be honest, I don't really understand the purpose of the brass "coil" if it's preventing the contact...

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You might also notice, that the "pinion" gear on the (image 10) is a little bit down, compared to the same gear on the (image 1).
As I said in the beginning, I put a gasket between the "pinion" gear (image 9) and the metal flap (image 8) to create a gap between the "pinion" gear and metal flap.*
*
When rotating, metal flap, goes all the way up, get's stuck in the "pinion" gasket's holes and no longer connects to the shaft.

After pressing the button - lock opened, and motor lifted the liftgate.
But, when I closed the liftgate and tried to open it again - it stuck. By "stuck" I mean - it even stopped to make sound liftgate makes.
So, opened the motor again. When I tried to pull up the "yellow" gear (image 1) - I felt the tension between the gears.
Manually, I rotated the shaft, a little bit counterclockwise and put every gear back in place. After pressing the button - lock opened...

What the problem could be?
 

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Good post with pictures and good description.
I have not been that far into the actuator like that. which one is it?

Is that the whirr that I hear as the liftgate sucks the final 1/2" of the door closure?
 
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