Andretti's racing career started in 1994 at the age of 15 with the help of his brother John, who helped Adam obtain a ride in the new half-scale Mini Cup Stock Car series, driving for Terry Lingner of Lingner Group Productions at the Velodrome in Indianapolis. He showed promise by winning four races in 1995 and finishing fourth in the series championship. After his stint in the Mini Stocks, Andretti raced karts. His brother Mark bought him a 125cc shifter kart and they raced for the next two years in the SKUSA series. In 1998, he finished second at the Formula C World Karting Championship held in Charlotte, North Carolina. He also ran in the 24 Hours of Daytona, an event sponsored by the Grand American Road Racing Association. In 2000, Andretti drove the No. 12 car in the short-lived United StatesFormula 3 Championship for Duesenberg Brothers Racing. He won a race and finished third in the series points championship. Then in 2001 and 2002, he drove in NASCAR's Featherlite Southwest Series. In 2003, Andretti drove a Corvette at Sebring Raceway in the SPEED World Challenge Series. He drove in the 2004 Rolex 24 Hours of Daytona. Andretti made his Indy Pro Series debut at Chicagoland Speedway on September 9, 2007. His race ended with an altercation with IndyCar veteran Jimmy Kite. Andretti announced after the race that he would compete in a full Indy Pro Series season in 2008. On December 17 he announced that he had signed a deal with the new FuZion Autosport team for the upcoming season. However, the team and Andretti failed to participate in any league-sponsored test sessions or enter any races. In 2014, he became the first member of the Andretti family to compete in the Trans Am Series, doing so regularly in the TA2 class. He has raced a Camaro, a Mustang, and a Challenger, picking up 6 wins and finishing second in points twice. In December 2017, Andretti joined UFD Racing for his Stadium Super Trucks debut at the Lake Elsinore Diamond in the No. 44 truck. He failed to qualify for the first feature race after finishing sixth in his heat race, and finished twelfth in the second feature after suffering a mechanical failure on lap eight. Andretti returned to SST in August 2018 at Road America, where he finished eleventh and ninth in the weekend's two rounds. He has also served as a racing instructor for Road & Track magazine and some driving schools, including the Richard Petty Driving Experience.
