 Despite having only run in 17 Craftsman Truck races, he came to a three-year agreement with Keith Coleman Racing in early November 2005 to drive the #23 Chevrolet Monte Carlo in the Busch Series.He raced once in the 2005 season at Phoenix International Raceway and finished 37th after crashing.In 2006, Wimmer tried to compete for Busch Series Rookie of the Year, but after missing many races, he was released.