Click HERE for game highlights video.
Wolff was making his first appearance since returning to Kansas City, where he played in 2003-06. He spent the last two seasons with German Second Division club 1860 Munich. Wolff tapped home a low cross from Jack Jewsbury in the 75th minute.
Kansas City had taken a 1-0 lead when Frankie Hejduk headed into his own goal in the 22nd minute and went up 2-0 two minutes later on Roger Espinoza's first career MLS goal.
The Crew got the next three goals, through Guillermo Barros Schelotto (24th minute free kick), Alejandro Moreno (26th) and Chad Marshall (33rd) to take a 3-2 halftime lead that lasted until Wolff's strike.
Schelotto notched two assists to give him league-leading 10 for the season.