Minor changes were made to the P1/01 for the 2015 season, including the transmission casing and a change to the bodywork. The revised car made its debut in March, at the Paul Ricard circuit. The car's number also changed from #9 to #4 for this season. The P1/01 claimed its first two wins in the Privateer class, at the Nurburgring and at the Circuit of the Americas. However, the car was excluded from the results of the 24 Hours of Le Mans due to incorrect driver weight ballast.