You need to look at your wiring integrity to the crank sensor. You should be able to take advantage of bias voltage on the signal wire. With a T pin, back probe the signal wire with the key on. Don't worry about the initial reading. Unplug the sensor. Your meter should jump to 5 volts. Then, while watching your meter, move the harness around. Look for any points of contact on your harness. While wiggling the harness and physically attempting to short it to ground, if your meter goes to zero volts, you've found a short to ground. This is what it sounds like to me. If it were a short on the 5v reference, you'd pull down multiple sensors at once and have many more codes. I believe that you have an intermittent short, or loose pin on your signal wire back to the PCM. At least, that's what I would test for next.