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have you checked the fuse for the circuit the hatch opening solenoid is on? Have you checked to see is power is on the circuit when you push the button? If the fuse is ok and there is power, you need to take things apart to get to the inside of the hatch door. then you need to check the back side of the button for power and check the solenoid with an alternative power source to see if it works or not.
Inside the rear tail gate hatch should be a small access panel. Remove the access panel so you can manually open the rear hatch by grabbing the small metal rod linkage. They put this access panel so if the door motor actuator goes bad you can still open the rear hatch. After you open the rear hatch manually by the linkage rod. Remove the entire inside hatch trim panel so you can see all the inner workings of it and self diagnos. It sound like the electric door motor actuator has gone bad. This is pretty common for any GM product. Hope this hopes.
I too had an issue with my rear hatch. My father in law cut a huge hole in the plastic only to find out there is a manual operation hole behind one of the carpeted panels in the hatch. You simply move the latch with pliers.
Hi: Under your hood in the power distribution box is a 3A fuse, if blow your door locks and rear wiper motor won't work, replace fuse. To manually open door ... take a pick or fine longer screw driver and insert it through the carpet liner on the interior back door (center, top of carpet you will find a indent under the carpet.) move pick to release the door latch mechanism.
hi you need to get into the hatch remove the cover and remove the soleniod which operates the the lock [power side of lock] then shut the hatch see if it works by key it should unless the locks faulty if it works ok see if there is any adjustment on the solenoid if so try to adjust it but if not replace the solenoid yates210456