There are two Possibilites with this issue ... Either the latches are bound or rusted and can be lubricated with lithium grease after cleaning or the plastic retaining clips may have broken inside your tailgate. To locate these, remove the three bolts holding in the latch assembly and inspect the clips attached to the two control rods that will latch/release your tailgate. I have found spraying white litium grease every three months into the latches of my tailgate has eliminated the same problem on my truck.
SOURCE: Latch won't lock when closing tailgate 2004 Silverado
most likely a broken spring inside latch
SOURCE: Tailgate won't latch shut
Lubricate all the components with silicone graphite spray can and keep actuating all levers.
Watch for any obstacles and deformity in latch , strike, ruber seals.
Vitally
SOURCE: tailgate latch on my 2002 silverado is stuck in closed postion
Remove the molding ring from around the handle. Becareful not to break the taps that lock it in. After removing the molding you should see the handle mechanism. There is a rod coming in from each side (each one runs out the the actual latch). Make sure each rod is connected into the handle assembly. If it is not put the rod into the hole and find the retainer clip to keep it in place.
SOURCE: GMC Envoy 2004 XUV tailgate
Two things happen. One the latch is already latched and therefore it's closed before the gate shut, When you try to close it you might notice that the door don't close all the way. This doe'snt have to be thwe case. the other thing that happens if the lock mechanism is working, You here it click? The latch is stuck as the opener is stuck. You might get lucky and spray the latch with Blaster or other rust buster type penatrant. Theres angles though the opening of the latch . Spray on several angles and repleatly close the door trying to vibrate the Penatrant into the stuck area. Looking at the latch use a screw driver to move the latch and see if you can cycle it though it's positions to see if you can latch and unlatch it with the tool and reopen by pullung the handle ( you may need to try ther inside handle too and even the remote openner if you have one. Ussaaaly you need to push the button twice to open the rear hatch so it may take a few trys and spraying to get it to come loose.. Some vehicals stay closed a long time and stuck is the way to think.. But if the door is used often the linkage inside the door mayh have come off the the latch is closed and the linkage doesn't open the laTCH AND THE THING MANAGED TO GET CLOSED WITHT THE DOOR OPEN.
SOURCE: Tailgate/trunk latch will not engage so the
Tailgate/trunk latch will not engage so the tailgate just bounces won't close - is there something I can do to fix this on my own?
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