The 2012 Auto Club 400 was a NASCAR Sprint Cup Series stock car race held on March 25 at Auto Club Speedway in Fontana, California. Shortened to 129 laps because of rain showers, it was the fifth race of the 2012 Sprint Cup Series season. The race was won by Tony Stewart for the Stewart-Haas Racing team. Kyle Busch finished second, and Dale Earnhardt Jr., who started fourteenth, clinched third.