IndyCar announced a six-position starting grid penalty for three series entries — the No. 06 Meyer Shank Racing Honda driven by Helio Castroneves, the No. 18 Dale Coyne Racing with HMD Honda of David Malukas and the No. 30 Rahal Letterman Lanigan Racing Honda driven by Jack Harvey — for unapproved engine changes following last week’s race at Nashville.

The named teams were in violation of Rule 16.2.3.2: “A fifth Engine is eligible to earn Engine Manufacturer points if a Full Season Entrant has completed the Full Season Entrant Engine Mileage with its first four (4) Engines. Otherwise, a fifth (5th) or more Engine does not earn Engine Manufacturer points and will be considered an Unapproved Engine change-out.”

The specified penalty for violation of this rule is a six-position starting grid penalty on road and street course events and nine positions at oval events and will be served at the series’ next event, which is Saturday’s Gallagher Grand Prix on the Indianapolis Motor Speedway road course.