2012 Mustang stalls

Can you tell where the buzzing is coming from? Did you check for wiring harness close or under the seat?

Pulled the seat out. both sides have a bladder to sense when there is weight in the seat. For some reason the drivers side has a very sticky foil tape holding the bladder in place. The wiring harness leading into the bladder has a sort of electrical tape sleeve on the outside. Anywhere the electrical tape is not covering the wires that touches the foil tape causes a tweeting in the bladder and the engine dies. I will add some insulation to the wires and have already removed the foil tape. Just goes to show the power of duct tape! I hear about so many issues of stalling Mustangs I hope others read this and look towards these seat sensors for any issues.

Keep them "fat girls" out of that back seat.

I have the same problem I just haven’t checked under the seat what did you do so it can stop

FIXED: I have a 2012 Mustang V6 that had the same problem (odd squeal and stalling) only with a rear seat passenger. The problem is caused by a short when weight from a rear passenger puts pressure on the fuel pump wiring harness under the seat grounding it out on the body floor pan (those are not bladders or weight sensors as described above). Our short was not visible but was reproducible with the seat off by pressing along the wire's path. If your wires are not bare or broken, a little adhesive strip of weather stripping to pad the grounding edges/area and some duct tape to reinforce the electrical tape on the harness will do the trick. Given the design and routing of these wires, I am surprised this issue is not more widely known.