I had to replace my tailgate button once, it was pretty easy to do.
When mine was starting to give up, I found if I held the button pressed for a while it would unlock the tail gate.
Failing that, you can get the tail gate open from the inside.
The tailgate actuator gets power from fuse 15.
Give the drivers door an open and close and lock and unlock, check the fuse and check the interior light is working.
If that doesn't help, rear seats down, remove parcel shelf, lift and remove spare wheel cover, unscrew hinge cover flap, remove large plastic screw type trim buttons from tail gate carpet and slide down to release it from top cover trim (may need to partially remove rubber seal around the tail gate).
You should now have access to the latch and solenoid.
Operate the linkage and the latch should open the top half, operate it again and the bottom should open.
Hope that is of some help!
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