THE SUV WAS PARKED IN MY MOM'S DRIVEWAY. I PUSHED THE REMOTE TO OPEN THE REAR POWER LIFT GATE. I CAME UPON THE BACK OF THE SUV WITH MY 3 YEAR OLD DAUGHTER AND THE LIFT GATE WAS UP. I WENT TO PUT SOMETHING IN THE TRUNK WHEN THE LIFT GATE COLLAPSED ON MY HEAD KNOCKING ME OUT AND TO THE GROUND. LUCKILY, MY MOM SAW WHAT HAPPENED, GOT MY HUSBAND AND MADE SURE MY DAUGHTER DIDN'T WANDER IN TO THE ROAD. I WAS KNOCKED OUT FOR A FEW SECONDS, BUT LUCKILY PEOPLE WERE AROUND. IMAGINE IF IT HAD HAPPENED NEAR A BUSY ROAD OR PARKING LOT. WE HAVE A 1 YEAR OLD AND A 3 YEAR OLD. COULD OF BEEN DISASTROUS. SO UPON SPENDING SEVERAL HOURS IN THE ER, I WAS DIAGNOSED WITH A CONCUSSION. MY HUSBAND LOOKED AT THE LIFT GATE, WATCHED IT GO UP TO THE TOP, STOP AND THEN COME CRASHING CLOSED. IT APPEARS IT WAS A COMPLETE FAILURE OF THE ROD THAT OPENS THE LIFT GATE, BOTH PISTONS OR ARMS THAT HELP LIFT AND SUPPORT THE LIFT GATE, AND THE SENSORS WHICH SHOULD TELL THE DOOR TO IMMEDIATELY OPEN BACK UP. THE DOOR CAME DOWN WITH SUCH FORCE IT COULD PERMANENTLY INJURE OR KILL A CHILD OR SENIOR CITIZEN. WE CONTACTED GMC IMMEDIATELY THEY TOOK DOWN OUR INFORMATION REGARDING THE CAR AND INCIDENT. TOOK GMC 2 DAYS TO CALL BACK AND GO OVER EVERYTHING AGAIN AND 2 MORE DAYS TO GET THE STORY FROM MY HUSBAND. SO 12 DAYS IN TO THIS AND ALL THEY'VE DONE IS COLLECT THE INFO OVER THE COURSE OF 2 CALLS. THEY ARE ALSO TELLING US THAT WE HAVE TO WAIT ANOTHER 8 DAYS JUST TO GET A FUTURE DATE TO HAVE THE LIFT GATE INSPECTED BY GMC.