Three of the four Joe Gibbs Racing cars will start at the rear of the field at Michigan International Speedway.
The Nos. 11, 18, and 20 will give up their top-10 starting spots in the FireKeepers Casino 400 as NASCAR announced all three had inspection failures for splitters that were not in tolerance. Kyle Busch had qualified third, Erik Jones eighth and Denny Hamlin 10th.
NASCAR officials began cracking down on splitters last month at Dover. All splitters must be flat.
Any additional penalties would be announced next week.