Busch started the 2015 season on suspension while he was investigated for allegations of domestic violence. Regan Smith took over the No. 41 car for the first three races of the year, finishing in the top 20 at both of the first two races. Although Smith competed for Xfinity Series points, the No. 41 car remained eligible for the owner's championship. Busch's suspension was lifted on March 11 and he returned to the No. 41 car at Phoenix, with a waiver to remain eligible for the Chase for the Sprint Cup. Busch scored his second victory in the No. 41 at Richmond in April. He scored his second win of the season at Michigan in June, in a rain-shortened event. Busch earned a spot in the Chase and made it through the three first rounds, but failed to make it to the final round. Busch finished eighth in the final points standings, with two wins and 21 top-ten finishes.