2003 Pepsi 400

The Pepsi 400 was the 17th race of the 2003 NASCAR Winston Cup Series season. Kurt Busch won the pole, his second of the season, with a 48.047-second lap around the Daytona International Speedway.

The race saw a crash consisting of at least 25 cars on the speedway's front straight. The crash injured Jimmie Johnson, who entered the race 7th in the standings and was a prime candidate for the title chase. The crash also sidelined Mark Martin for a week, who was suffering from concussion-like symptoms.

The race was won by Dale Earnhardt Jr. while point leader Rusty Wallace led the most laps. It was the first win of the season for Earnhardt Jr. who came into the race 22nd in standings. It marked Earnhardt's first top five of the season.