Out of Time

Out of Time is a main quest in Fallout 4.

Detailed walkthrough
Retrace the path the player character took to get to the vault to get back to the Sanctuary Hills. Codsworth will be near the player character's home.

Explore the neighborhood by following Codsworth who is searching for signs of life. This will lead to combat with Bloatflies and radroaches. When two battles are done, Codsworth will suggest the Sole Survivor go to Concord to continue the search for Shaun. It is possible to invite Codsworth to accompany as a companion.

The road to Concord leads south out of Sanctuary Hills across the bridge. On the way, there is a Red Rocket truck stop where a dog can be found that is willing to accompany the Sole Survivor as a companion. Upon reaching Concord this quest will complete and the next quest When Freedom Calls will begin.