The 2005 Auto Club 500 was a NASCAR Nextel Cup Series stock car race held on February 27, 2005 at California Speedway in Fontana, California. Contested over 250 laps on the 2-mile (3.23 km) asphalt D-shaped oval, it was the second race of the 2005 Nextel Cup Series season. Greg Biffle of Roush Racing won the race, his first win of the season. Jimmie Johnson finished second and Kurt Busch finished third.