Holiday over. Back to the truck, won't start?

Story:
Drove the truck a few times, ran good. The last two times, while driving it, it would just totaly, instantley, shut off. Like an instant fuel or spark stoppage. Didn't have a scanner so parked it, not wanting to get stranded. Thinking that it may be the 2"-3" fuel pump connect hose, pulled the bed off, replaced hose and now double clamped (though the original was fine) and attended to two other problems. Now with the bed back on.

Scanned:
Pulled 3 codes. P0172, P0175 and a P0335.
It is my understandind that the only code of the 3, the P0335 is the only one that will cause a no start.

Question:
Where do I start? Replace the crank sensor, try the relearn of the pcm to the sensor (if so, how).

Once again. I am pretty lost at this point.

Thanks.

yeah, check for shorts while you're at it. Slip a heat resistant tube or something over the wires to protect them from exhaust heat and chafing.

planned on checking wires tomorrow. Have them tucked in pretty tight.

If I replace the sensor will the pcm relearn on its own or do I need to talk to Nelson?