For the 2015 season, his Penske car was fitted with Chevrolet's updated aerodynamic package. Castroneves achieved consecutive second places in the Indy Grand Prix of Louisiana and the Grand Prix of Long Beach and two pole positions. During practice for the Indianapolis 500, he lost control of his car in the first turn, and struck the barrier, flipping his car over 180 degrees and landing upside down. He started fifth and ran consistently within the top five but finished seventh. The rest of the season saw Castroneves achieve consecutive third places in the Firestone 600 and the Honda Indy Toronto and was second in the ABC Supply Wisconsin 250 along with two more pole positions for fourth overall with 453 points.