Adam Stevens, crew chief, was fined $20,000, suspended from all NASCAR Series Championship points events through May 18 and put on NASCAR probation through Dec. 31.
The No. 18 team's front tire changer, Josh Leslie, was suspended through May 18 and put on NASCAR probation through Dec. 31.
The No. 18 was penalized under sections 12:1 (actions detrimental to stock car racing), 10.11.3 (pit road equipment) and 126.96.36.199.1 (which outlines the P3-level penalty) of the NASCAR Rule Book.
Busch started sixth and finished first at Kansas for his third win of the season. Busch, the 2015 series champion, sits atop the Chase for the NASCAR Sprint Cup Series standings.
In addition to the No. 18 team's penalty, NASCAR issued written warnings to the Nos. 43 and 78 teams (for failing pre-qualifying laser inspection twice) and the Nos. 7, 43, 47 and 48 teams (for failing pre-qualifying template inspection twice).