Is this the XUV version? There is a known problem with all Trailblazers and Envoys with the wiring harness at the top of the gate. Pull that little rubber boot off and look at the wires in there. Are their chaffing wires in there (rubbing against the metal door, which will remove the plastic covering on the wires)? If so, put some black electrical tape (99 cents) around the exposed wire and this should fix your problem. Also, check the rear fuse box located under the rear drivers side seat (just fold the bottom part down. There is a fuse in there that controls the tailgate, check this fuse, chart will be either on the bottom of the cover or in your owners manual as to which fuse.
If both of these check out to be good, could be the lift gate control module
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