Trying to change trunk latch, how do I disengage it from cylinder lock on a pontiac g6

generic help and parts in the link

https://www.google.com/search?q=2006+Pontiac+G6.+How+to+replace+trunk+lock+cylinder

..

Did you check for a loose electrical connector on the trunk lock mechanism? There was a small two prong connector that was loose on my 2001 Pontiac Grand Am I connected it and the trunk button on drivers door now works and when I get a new key fob I am sure it will work.

Some obstruction? Try to reactivate the release, and shut.

Before taking this problem to the dealer, you might check this quick fix. I had the same problem on my 2007 Pontiac G6 Gt Convertible, and just resolved it.
First, you can access your trunk by disconnecting, and then reconnecting your negative battery terminal-this clears the safety code momentarily allowing the trunk to be opened using your trunk release button.
After you have the trunk open, check the wiring harness located in the top right corner of the trunk lid where the hinge is attached to the trunk lid. My wiring harness had come loose, allowing a wire to get stuck in the hinge, resulting in a cut wire-it was a red one. I spliced the wire back together, taped it up with electrical tape, and then secured the harness to the hinge assembly so wires couldn't come loose again. The problem resolved immediately with no further issues. Good luck.

Any repair shop (body shop or auto repair shop) should be able to handle trunk repair. You may want to look through your local yellow pages. Have you tried spraying a lubricant into the latch assembly, sometimes it help to lube it and use a screw driver to flip latch/lock to locked position and then release with key or trunk release button several times. Rust is prone to jam locks and latches. Most local auto parts stores carry these latches in stock, and it is relatively easy to change out. Let me know if you need further help.

there is a little finger in the latch that closes when the trunk is closed chances are that the little finger has closed but the trunk is still open... this can be fixed by looking at the latch on the lid you will see a slot with a metal arm in the middle take a screw driver and place it in the hole in the slot at the top. press the button on the fob to open the trunk while your pulling down on the screw driver the little latch should twist letting the screw driver move through the track and pop out now alowing you to close the trunk and being happy again.

is the button stuck or check the ajustment on the trunk latch to make sure its locking all the way

should be a connector on the latch itself that is hooked to a release solenoid find it and unplug it

Yes if your lock actuator is not stuck on unlock.Try unpluging the harness to rhe electric lock,and see if it will lock and stay locked using the key.If ti works then your okay.if you still have the problem then your tounge that holds the trunk down needs to be replaced.

Close your trunk.... If trunk is closed you probably have a bad trunk latch sensor thats needs to be replaced.