Chip Ganassi Racing’s Chad Johnston has become the fourth Sprint Cup Series crew chief to be suspended in eight days. During post-race inspection following Kyle Larson’s eleventh-place finish on Monday at Pocono Raceway, it was discovered that all the lug nuts on his Number-42 Chevrolet were not properly tightened.

Johnston received a one-race suspension, was fined twenty thousand dollars and placed on NASCAR probation through December 31 st . On June 1 st, Cup Series crew chiefs Randall Burnett (who works with A-J Allmendinger), Tony Gibson (Kurt Busch) and Brian Pattie (Greg Biffle) were suspended for rule violations at Charlotte.

In addition to Johnston’s suspension, six Cup teams were given written warnings on Wednesday for a variety of inspection violations at Pocono. Drivers whose teams were warned are Aric Almirola, Matt DiBenedetto, Ty Dillon, Jamie McMurray, Danica Patrick and Regan Smith.