My drivers side door doesn't close all the way because the lock in the door only latches about half way..It will stay closed going down the road,, BUT it's not latched or closed tight.

It sounds like the latch assembly to me. Go to the dealer buy one and install it.

Inside door mechanical issue broken

adjust the latch so that the catch will lock over properly. You may need to use a round bar ( screwdriver blade ) Place it under the latch and while pressing on the release button pull the latch out to the open position. The latch may be 1/2 closed before the boot is put down and the latch will not go any further

if you talking about door latch wont let door close.try to reset all door locks.first if you cant get door close.work unlock button with remote or door switch.then hold open door handle while you flat screw driver pull up latch in door latch should stay up so door will close.once get door close.try resetting all door locks by sitting inside vechicle with all doors close.remove key from ignition.open drivers door.wait 24 seconds.turn ignition switch on and back to lock position 3 times.press and release drivers door courtesy light 3 times.ensure doors lock and unlock.if not wait 40 seconds and repeat procedure.if this procedure fails. you have problem in the door latch and lock mechanism inside the door itself.

Check the latch mechanism on the side of the door away from the hinge. The easiest way I can think of to do this is to push a large bolt (about the same size as the door latch pin on the frame) into the latch mechanism to simulate the door closing action. The latch should close over the bolt and not allow you to pull the bolt out in the door open direction unless you open the door handle.

If the latch works properly, check the door alignment to make sure it is actually engaging the pin.

I have shaved door handles on a 2000 chevy silverado and the drivers side door just recently stopped opening it seems like its completely locked out and the door is closed so i cannot get to the bolts of the latch assembly when i hit the unlock button it unlocks half way and when you go to open the door it relocks itself even if you manually try to unlock the door and hold the lock forward it still wont open

Try cleaning the latch with WD40. Work the latch open and close with your fingers and lube it with the WD40.

It sounds to me ( correct me if I'm wrong ) like the door latch on the side vertical edge of the door is in the LOCKED POSITION. In order to unlock it perform the following. First electrically with the LOCK button UNLOCK the locks. Now with one hand hold the OUTSIDE DOOR HANDLE IN THE OPEN POSITION, while at the same time FLIPPING OPEN THE LATCH. All Done . Now you can close the door. Hope this helps

Have a close look at the door latch and see if it is in the lock position. If it is, pull the door handle like your going to open the door and place a screw driver or a pen in the latch and pull it open and then try to close the door and see if the latch holds the door close. The chances are good since most GM products are interchange able, the salvage Yard should answer that for you and can tell you better short cuts then any body on how to replace parts. Good luck and hope this helps, keep me posted. Be glad to help.

the door ajar switch in the drivers door latch is is either shot or sticking.open drivers door spray some WD40 in the latch,open and close door several times and if the switch is only sticking this will free it up.