Indianapolis 500 runner-up Marcus Ericsson was one of three top-12 finishers from Sunday's race whose cars failed a post-race inspection, resulting in a drop to the back of the field.
For Ericsson, that means that he fell from second place to 31st out of 33 drivers who competed.
The cars driven by Ericsson and his Andretti Global teammate Kyle Kirkwood were found in their post-race inspections to have unapproved modifications to the covers on their Dallara-supplied Energy Management System hybrid units.
Per IndyCar, those units are required to be used as supplied, and the modifications “provided the capability of enhanced aerodynamic efficiency to both cars.