The Predators then ran off four unanswered goals to hand Columbus its fourth straight loss. The Blue Jackets are at the bottom of the NHL with 22 points.
Nick Spaling and Roman Josi scored for Nashville in the second period to bring the Predators within 5-4.
Columbus fought off Nashville for most of the third, but David Legwand delivered a power-play goal with 3:46 remaining to tie it.
Erat completed the rally by putting a backhander past Curtis Sanford, who gave up six goals on 38 shots.
Pekka Rinne rebounded from a difficult start to shut out the Blue Jackets for the game's final 32:08. He made 26 saves.