Rear hatch will not come open. can hear a motor

remove rear panel and check latch for damage or linkage disconnect --also check electrical connections to other components

you probably need new hatch shocks

My Envoy does that too. I figured out the unlock automatic setting on my keys had to be pushed twice!

if it clicks when pushing button the lock is disengaging try providing a little pressure on door and have someone push the button it will probably spring open. the struts might not have enough power to pop it open

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.

Had the same problem removed the hatch interior panel, removed a little grim from the working parts, loosened the 10mm bolt securing the lock motor, manually worked all the parts and sprayed a bit of wd-40. Its been about a week and no problems since. I did this because of two problems 1 using the remote the lock wouldn't fully disengage (but could hear it working) and 2 would also encounter problems trying to manually unlock with the key.
02 xterra 4x4 SE

If you hear a click in there it is probably latch linkage fell off. If no click at all inside the hatch, then could be the solenoid or the solenoid wire fell off.

With regards to the lock bittons on the driver and passenger side its the button themselves aka switch(s) that is your culprit. Why because the remote is getting the motor to open and close them . The only thing that doesn't is the buttons /switches themselves .
Now the rear latch a little different animal. Either the locking mechanism on the door itself is defective or the motor ( the thing you hear clicking) is weak.
This one your gonna need a shop manual for to do the correct testing.But being that te remote will not move it and neither will the manual push button I would lean towards the locking mechanism on the hatch/door its self. Use the shop manual its not that bad of a fix if you have a little patience.

First, on the rear hatch, there is an actuator. On FX, when you close the trunk, it kind of **** the hatch closed all the way. When you press lock on the remote, this same actuator locks it as well.
Now,
1) when you unlock the car from the inside, go back there and press the button to open the hatch door manually, do you here any noises?
2) Close all doors, go back close to the hatch button and using the remote , lock the car and then unlock the car. you should hear a sound from the actuator locking and unlocking the lock on the rear hatch!

If you don't hear this, your actuator is inop.
Next step would be to check the fuses inside the car, on the left bottom driver side, and outside on the battery compartment.
It might be just a fuse.
If all fuses check ok, your actuator is most likely gone! Not ea expensive fix, just time consuming!

NOW, if you can hear the noises, then something is either broken inside the actuator or one of the cables is loose!
Hope that helps.
Also, what year and miles on your fx?

Check the unlock mechanism for the hatch. These are controlled by an electrical motor pulling a cable. If the cable came loose you might or might not hear the click click that it makes. I would also check the fuses and relays related to the system. Usually if you can get the interior panel off all the innards are exposed. I would suggest pulling that panel off, then triggering the keyless remote and see if anything moves, that might pinpoint where it has gone bad.