Lift gate latch won't work on 2012 Yukon xl - Cars & Trucks

SOURCE: 07 GMC Yukon liftgate will open, but not close automatically

Check on the Strut Assembies on Each side of the Door. There should be a Safety device on them that will allow you to keep the door up, They could be Catching at the Open Position.

SOURCE: lift gate wont open with remote

I spend the next 10 minutes alternating between randomly hitting the FOB’s lock and unlock buttons, until I give up in a garage-filling string of expletives as I realize my kayak and I are SOL. Luckily, I did have a friend and an incredibly helpful REI employee there, whom all pitched in and managed to jam the kayak into the Suburban through the side door. I love my Suburban for reasons like this, though I’m slowly starting to hate GMC. More on this to come.
Here’s the Suburban with kayak inside and the lift gate panel on the floor. If you have a Suburban / Tahoe / Yukon in the same situation where your lift gate won’t open, the only way to get it open is to pry the lift gate panel just enough to access the locking mechanism. Take a long flat head screwdriver, slip it into the top section of the panel and start pulling away. The panel is made of a flexible plastic that will bend a fair amount, so don’t be afraid to put a bit of elbow into it. Once you see the locking mechanism, you’ll want to grip the back side that moves and twist counter-clockwise until the door pops open. Once you’ve done this, call GM customer service and tell them that their engineers should be fired for not having a manual release. If there is an accident / fire up front, wouldn’t you like it if your kids could escape out the back? Yeah, me too.
If you’re lucky enough that you can open your door (or maybe it doesn’t lock to begin with), then it’s a little easier to pull off the panel. First, take a socket wrench (9mm, I think) and remove the bolt under the leather handle on the inside of the door (the one you pull down on when your lift gate is up). After that, insert a flat head into the space between the panel and the door and pry open. There will be around 4 or 5 contact points to disconnect.
The two last things that stand in your way are plastic hinges that hold the panel to the door frame. With the lift gate open, push the panel toward the car, then spin it an entire half-circle around the hinge in the picture. After that, the panel should pull right out. Now the locking mechanism should be nicely exposed.
Here we see the lift gate handle at the bottom, which is connected by a tension wire to the locking mechanism. Pulling on the handle causes the wire at the top to retract toward the right, turning the locking mechanism counter-clockwise.
However, pulling the handle does nothing when the mechanism is in the locked position, because it doesn’t engage the other tension wire / tailgate release - it just simply moves by itself. When the mechanism is unlocked, pulling on the handle will engage the release mechanism and pop open the door… when the locking mechanism is working, that is.
Here is a properly unlocked door: notice that the black plastic piece (on top of the copper) is slid all the way to the right. You can see that if you rotate the lower copper piece, that it will force the black plastic piece to turn, thus engaging the door release.
Here is why your Suburban tailgate won’t unlock. I’ve just pressed the unlock button on my key FOB and you can see that the black plastic piece has NOT slid over to the right. This means that the door is still LOCKED as far as the mechanism is concerned. No amount of yanking on the handle will open the lift gate at this point.
Zooming in for a close-up, you can really see where the problem is. Gear heads will realize this is a major problem for all sorts of reasons. First, if your door lock actuator is banging against this metal part every time you unlock your door, it will wear out the part extremely fast and you’ve got yourself a busted door. Second, even if you replace your actuator, you’ll just bust it again if it keeps ramming this part. Most importantly, the question is how this is happening to begin with? My Suburban was working fine until I put in a factory replacement handle.
My opinion is that the factory GM replacement was defective and not built to spec, because the tensioner was now pulling a few millimeters more than it should have, which resulted in my lift gate not closing or unlocking. While millimeters might not mean anything to some cheap factory in China or Mexico, it means a whole lot of difference to the Joe Schmoe who wants to have a car that works. It may also be due to a small and very important spring that resets the lock back into place.
I’ve read a whole ton of reports about Suburban lift gates, along with Tahoes, Yukons and other GM cars failing and drivers stuck with unlockable doors. I believe this type of careless “few millimeters off isn’t important” BS is likely to blame. That’s why some people may have locks that work only half the time, or some work after their actuators are replaced, but fail soon afterward. My two-cent opinion - back to fixing cars.
So what we need to do, is make some space for that locking (technically, “unlock”) mechanism to engage fully. On my Suburban, this meant giving the metal tensioner just a little more slack - 2mm would be all I need.
First, I pushed the handle wire mechanism over to the right and then pulled out the metal ball and wire. After that, I pinched the blue wire cap and pushed it out of the metal holder.
You can now see that there is a lot of visible space between the locking mechanism and the metal. Pressing lock and unlock on my key FOB easily moved the unit back and forth successfully, so I knew it wasn’t a problem with the actuator. Now comes the disclaimer part.
DISCLAIMER: Attempt this section at your own risk, you are responsible for your own actions!!! Not seeing a lot of options, I decided I would take a somewhat drastic approach and bend the wire holder closer to the locking mechanism with a pair of pliers. I only needed about 2mm, so I felt this was acceptable without busting the car too much. Needless to say, this is not a graceful fix nor one I really wanted to do, but there appeared to be little other options other than cutting your own tensioner line (adjusting the line would be the most logical method, but I pinching and pulling got me no results) or finding some concrete way of bracing the line closer to the locking mechanism. If you come up with an elegant solution, please let me know.
Phew, finally - the fixed tailgate lock! You can see there is just enough room for the mechanism to engage and that the handle tension wire is snugly seated into its new home. I tested the lock about 100 times to be sure that everything was working as it should and I advise you do the same once you get to this point.
Now, simply put the panel back on the same way you took it off (don’t forget to screw the bolt back into the handle) and you’re done. Have a beer and go pat yourself on the back.
If this blog post has helped at all, I’d appreciate if you left a comment to share you experiences so others in the same situation can hear what you did. Thanks.

SOURCE: lift gate latch of 2003 Ford Escape

I just want to know if there is any manual to disarm the lift gate and check for the problem. Currently my door is lock and cant open, how you force it to open?

SOURCE: 2001 Toyota Sequoia lift gate latch broken, door is locked closed

Take a look at my other Sequoia posts about this.

You need to remove the interior pull handle first then gently pry away the interior panels from the top down. Go look at Tundra Solutions.com for the detailed procedure on the handle assemlby replacement but here is a rundown:

First, take off the license plate.
Since the hatch wouldn't open, I started from the inside and took down the top trim piece. After that the two side pieces come down, then the main trim piece which covers the bulk of the door comes out. These are all popped in with the white tabs.
There are 3 access hole covers to pop out (don't forget to install them back in when done) and through the left hole you can see the mechanism to unlatch, press it down with a screwdriver and open the door. If anytime you close the door you will have to do this to unlatch, up until you disconnect the cable and pull out the handle, then you have to locate the cable and pull that directly.
Behind the large trim piece you will find a metal access cover, remove the 7 or 8 10mm bolts holding that on and pop the 3 white tabs and let it hang off to the side. Disconnect the cable from the handle assembly by reaching in from the right hand side and popping of the cable from the handle assembly.
From the left and right access holes, locate the two 10mm nuts which hold the license plate assembly to the door and remove them. Then there are 4 plastic tabs that come in from the outside that hold the license plate assembly on in each corner, try and locate those and using some pliers squeeze them together and push it through. Next locate the license plate lamps wire connector and release that from the left side, it’s the simple push in and pull out square white connector.
After these are out, put back in 1 or 2 bolts into the large metal access cover so the hatch can be lowered (don’t close it).
Here is where I had fun, begin to pop out the assembly that it was bolted to. I ended up breaking 3 of the 4 plastic tabs in each corner because I did not use pliers from the other side to pull them out, however it remained somewhat useable (hindsight 20/20).
Now the license plate assembly can be taken to a bench to replace the handle assembly (Toyota doesn't sell just the handle, it is a small assembly). Two screws out and the assembly is replaced.
Before pressing the license plate assembly back onto the truck, make certain all the plastic tabs are in the assembly and not in the truck. Reverse the process to re-install.

SOURCE: 2008 Tahoe: The automatic back lift gate on my 2008 Tahoe stop...

I found this URL on internet http://www.chefseattle.com/blog/site-news/suburban-rear-liftgate-wont-unlock-how-to-fix/ If your vehicle is similiar maybe it can help.