Dead plug in bathroom is this a valid solution?

I have a dead GFI plug in my bathroom. The plug itself is not bad, but the wire going to the plug has no juice, I tested it with a current tester. My theory is that the wire got disconnected from somewhere that was feeding it the power inside the wall. ALL OTHER GFI plugs in the house work and reset correctly. Everything in the circuit breaker box has also been reset.

Do you know - is it legal to just cap off the wires and put a blank face plate on the box?

I know it is a code requirement to have a GFI outlet in the bathroom so we could always install a GFI outlet where the switches are for the light and fan since I know that power feed works. Just don't know if I have to tear my house apart to find the source of the dead wire or if I can just leave it.

I cannot see inside the wall to see anything either. The wallboard
is stapled and then glued onto the 2x4s....I tried.

Have been trying to troubleshoot this plug for over 2 months now and cannot find the power source. Hence, why I about to give up and just cap it off. Please let me know if that is legitimate.

 

In general, you can cap off wires and put a blank cover on the box. However, code requires a GFCI-protected receptacle within 36" of the sink.

Trying to add a receptacle to a switch often fails if the switch is wired with a switch loop. If there is not a white wire attached to the switch, then you can probably do it. Leviton makes a switch/GFCI receptacle combo.

My guess is that an electrician could find the problem in five minutes.

 

Capping off the wires at the receptacle instead of disconnecting them from wherever they feed from,could leave a fire hazard in the wall from the wires arcing at the break.I urge you to have an electrician make the necessary repairs.

 

Look at the other GFCI that are in the house. They are wired in series with each other and the connection at the last one before the one your having problems with is probably where the open circuit is, even though that one may be working fine. Also it could be wired wrong. There are connections for line in and to next device, make sure that they are not reversed.
STIMPY21