Each team was also docked 10 owner points.
Neither team will appeal their penalty.
Harvick drops to 58 points behind Kyle Busch but remains second in the standings. This is his second points penalty of the season.
He lost 20 regular-season points and seven playoff points after sweeping both stages of a victory at Las Vegas Motor Speedway. NASCAR ruled the car had a failed window brace and side skirts that were aluminum instead of steel.
Kahne fell a spot to 28th in the standings, nine points behind Michael McDowell.
NASCAR also issued two indefinite suspensions.
David M. Little, Jr. was suspended for violating NASCAR’s substance abuse policy.
Douglas E. Chouinard was suspended for violating rule 2.11.a in the rulebook, which states, “Any NASCAR Member charged with any violation of the law (misdemeanor and/or felony) shall notify NASCAR … prior to the next scheduled Event or within 72 hours of being so charged, whichever is earlier.”