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Try removing the plastic panel inside the hood and make sure nothing is jamming the locking mechanism.
Some of the manual trunks have a loose nut that jams the mechanism.
Make sure there is no water below the trunk floor. I think the power liftgate module is under there.
 
From how I read the post it sounds like the tailgate will not lower, as in stuck in the upright position. I don’t think it’s a closes but doesn’t lock situation. Sounds like the power ram is bad. Already replaced the helper ram, so I could see why it opens but not closes…
 
Update: All the home remedy resetting attempts have failed to fix the problem. I went to the dealership the other day and they asked for $160 to diagnose and give me a quote to fix it which I felt was a little steep for what is essentially a convenience issue.

I'm going to try and find some tutorials for replacing the powered strut and maybe do some more in depth electrical investigating myself when I have a nice warm weekend day. Any advice or resources would be greatly appreciated. I already have the Haynes manual (online version).

Hello, did you find the solution to the problem finally?
 
So i took the power strut off, and yes the blue wire was ripped apart. On mine though, it was broken too close to the strut end to be able to solder together. I ordered a replacement strut from ebay and it works again. The ebay one is a cheaper knockoff but it works, only thing I don't like is the rubber grommet needs to be just a touch bigger to securely fit the hole. I'm going to grab some black RTV silicone from work and that will take care of any potential leaks.
 
Power Tailgate won't close, Deja Vu.
Opened the tailgate to put groceries in the trunk. Would close but didn't latch. Pushed the latch mechanism with a screwdriver, didn't work, latch mechanism seems to be ok.
So when I got home I looked up what fuse to pull to reset thef PLGM. The NEW cover I put on the PDC shows the fuse locations, but doesn't list what the fuses are for.
For my 2014 TH it is F23 70A in the PDC (BCM feed 1). Looking at the fuse you can't tell if it is blown or not, so I checked it with an ohmmeter. Fuse was good. Waited maybe 10 minutes and put the fuse back in. If you are looking for a Power Liftgate Fuse you will never find one.
Trunk would open and close but still not latch. When I pushed the long rubber button on the lower edge of the liftgate, that fixed it (make sure the Power Liftgate is closed).
Apparently pushing the button tells the software the lift gate 'fully closed' postion.
 
Happened again today. Naturally I was off road.
Fortunately I put Post #32 in my Hayne's Repair Manual where I could find it.
Turned off the Jeep, got out and closed the driver's door.
The liftgate was closed but not latched. Pushed and held the long rubber button on the lower edge of the liftgate.
The latch made some faint noises. The liftgate finally latched properly. All is good. Didn't need to pull any fuses or do anything else.
 
Happened again today. Naturally I was off road.
Fortunately I put Post #32 in my Hayne's Repair Manual where I could find it.
Turned off the Jeep, got out and closed the driver's door.
The liftgate was closed but not latched. Pushed and held the long rubber button on the lower edge of the liftgate.
The latch made some faint noises. The liftgate finally latched properly. All is good. Didn't need to pull any fuses or do anything else.
That's why you need to wash that thing a little more often than just when it rains, and shot of lube on all the latches and hinges once in while doesn't hurt either...LOL!!!😁😉😎
 
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