Car owner Roger Penske also was penalized 100 owner points because of Busch's infraction.

"We felt like we got everybody's attention," said Robin Pemberton, NASCAR's competition director. "We felt like the 100-point penalty, the $100,000 was substantial."

NASCAR placed Busch on probation until Dec. 31. With the penalty, Busch fell from 11th to 17th in the Chase standings. The top 12 drivers are in the final 10 races for the title.

"I regret the incident that occurred at Dover and apologize to NASCAR, my sponsors, the fans, my Penske Racing team and Joe Gibbs Racing," Busch said. "I understand that safety is crucial to the sport and I accept the points penalty, fine and probation that NASCAR has imposed on me."

Busch and Tony Stewart were both running in the top 10 in Monday's race at Dover International Speedway when Busch clipped Stewart as he went to make a pass in lap 271. Busch nosed into the wall and Stewart was sent hard into the SAFER barrier on the outside retaining wall.

While Stewart's team checked out the damage to the No. 20 Chevrolet in the pit stall, Busch pulled next to Stewart's car, forcing jackman Jason Lee to jump back and onto the hood.

NASCAR parked Busch and he finished 42nd.