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JOLIET, Ill. -- The race-winning entry of driver Kyle Busch failed post-race technical inspection following Friday night's American Ethanol e15 225 at Chicagoland Speedway, according to NASCAR officials.
Busch, the defending Sprint Cup Series champion, won for the second time this season in the NASCAR Camping World Truck Series; it was his 46th career series win as well.
The No. 18 Toyota measured too low in the rear during post-race inspection.
Similar infractions this season have resulted in a fine and probation for the crew chief as well as the loss of driver and owner championship points.
The official announcement of any penalties would be made by NASCAR officials next week.