It is assumed that you are referring to the rear hatch glass and lower door. If the hatch glass is not releasing, check the fuse that controls power to the switch and
lock. If you are referring to the door iteself, you will probably have to remove the inner panel of the door to access the lock mechanism. If you are not 'handy' with tools you may have to take it to a repair shop or dealer.
You can open it from inside the trunk by lowering the back seats. On the inside of the trunk door, there is a white lever. Pull it and the trunk will open.
To fix a trunk latch that is stuck open, the teeth on the lock may have to be adjusted so the trunk will close. It is also possible that the cable for the trunk latch is broken. To fix the gas cap door latch may require a little bending and adjusting with a pair of pliers.
On the fuel door side of the Trunk free the plastic fastners attaching the inner trunk lining. This should allow you to see a small metal lever attached to the electronic solenoid. Pulling this to the rear will free the stuck door.
You can not close any door if the locking mechanism is stuck in the locked position. You must first get the mechanics to unlock.
you just have to push up on the latch
In the trunk, under bottom cover.
Look inside the trunk and there is a ring that you can pull directly on the wall of the trunk on the inside of where the fuel tank door is located. Our Volvo had electrical problems in cold weather and the fuel cap door sometimes sticks when the vehicle is unlocked.
Did you find a resolution to this?
It should lock and unlock with the power door locks. If it is stuck in the locked position, there is a lever in the trunk on the driver's side behind the carpet that will unlock it.
your trunk latch may be stuck in the open position. The latch pushes to the left to open, try pushing it to the right and see if it pops into place.
May be a manual release inside the trunk
Door Switch is mostl likely stuck or faulty (inside door jamb- plunger like part)