Hey all! Probably late to this post but stumbled upon it since I got this same issue with the fuel lid not opening.
In my case I initially tried few things but of no use but then thought of giving a try of what @Roberto280 suggested. Thankfully, I could hear that the motor is working, so I gave open-close the lock button a few hits but didn’t help. Then I thought, lets reduce the load on the lock that actually rotates and holds the lid, so I pushed the lid a little in and then locked and unlocked the car, silly but I had to give it a try. That worked.
Not a good approach by the Design Engineers to rely just on the electromechanical mechanism, needed a manual emergency release.
In the case where the motor works and the lock is stuck, this can resolve the issue. Hope this helps!
So now, I’ve applied a little silicon to the plunger/lock so that it operates smoothly.
Thanks all!