There was a bulletin issued on the door not closing all the way, but not sure if it said anything about not locking. If the door is completely closing, and fails to lock, sounds like the lock actuator might be bad (or disconnected).
Best thing is let the dealer look at it.
Here is the bulletin for the door not being aligned correctly.
Door Ajar Lamp On, Chimes Sound or Door Locks Cycle While Driving (Adjust Swing Gate Striker) #05-08-66-006 - (Oct 11, 2005)
Door Ajar Lamp On, Chimes Sound or Door Locks Cycle While Driving (Adjust Swing Gate Striker)
2006 HUMMER H3
Condition
Some customers may comment that the "Door Ajar" lamp comes on, chimes sound, or door locks cycle while driving.
Cause
The swing gate switch plunger may not be sufficiently depressed when the swing gate is closed due to door fit variation.
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Black Sheep Hummer Squadron
(ME TOO)
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