So my stove electronics died twice and finally tracked it down to the outlet not having a ground.

I opened up the outlet and i do have 12/2 with a ground but the ground screw on the actually outlet is not connected.

Can I simply connect a piece of copper wire from the outlet ground screw to the ground on the existing 12/2 with ground?

I have done this and checked with one of those outlet testers and it says its grounded but I figured I'd ask here before I plug the stove in.