2012 SRX,when i open my tailgate it goes up bucks twice up and down, and closes.

Hello, The liftgate is expected to raise until it meets a certain height. It also knows not to continue opening if it hits something. When the vehicle does not get input that says the door is at full height, it does not stop the motor, therefore, when mechanical limits of abduction are reached, the car shuts retries once, and then closes the door to avoid damage. Basically, you can open the door, and repress the button to stop it at the desired height until you have it repaired. Let me know if I missed anything, or if you would like additional information. Otherwise, here is a link to certified services in your area: http://repairpal.com/cadillac-within-10-miles-of-anniston-alabama-36201