Emission code is P0449?

A rubber hose approx 1/4 inner diameter dropped about a foot down under truck. Tracking the hose it splits over transmission attaching to small metal pipe mounted near the top to the bell housing. The hose other part of split went up to engine block where it had what looked like a plug or check valve? Ending with no further connection at the engine. I could not find anywhere to mount the hanging part of the hose. The only code is p0449 but all of the lines from the rear are intact. Can’t find any diagrams for this line.