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Q:

my tailgate locks up and i can't get it open on 2006 Buick Rainier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when the message rear is open
(1) Answer
if you check on the inside tailgate panel there is a access hole pop it off, use a flashlight to see inside of hole lever on right, one on the left, use a couple of screw drivers push both levers up that should release your back hatch.