After the post-race inspection process at Las Vegas Motor Speedway NASCAR officials issued penalties to six Cup Series teams including one suspension.

The most serious of these was for the Stewart-Haas Racing number 41 team driven by Cole Custer. NASCAR found two lug nuts improperly secured after the Penzoil 400. As a result of the infraction; crew chief Mike Shiplett was fined $20,000 and suspended for the race at Phoenix Speedway.

Five other Cup Series teams were also charged with a lug nut infraction and had their crew chiefs fined $10,000 each…
The Stewart-Haas Racing number four car driven by Kevin Harvick with Rodney Childers as crew chief
The Roush Fenway Racing number 17 car driven by Chris Buescher with Luke Lambert as crew chief
The Joe Gibbs Racing number 18 driven by Kyle Busch with Ben Beshore as crew chief
The Joe Gibbs Racing number 19 driven by Martin Truex Jr with James Small as crew chief
The Wood Brothers Racing number 21 car with Matt DiBenedetto with Greg Erwin as crew chief

In the Xfinity Series, the Kaulig Racing number 16 car driven by AJ Allmendinger with Jason Trinchere as crew chief was also charged with having an unsecured lug nut and was fined $5.000.

In the Camping World Truck Series, the Halmar Friesen Racing number 52 truck driven by Stewart Friesen with Trip Bruce as crew chief was also found to have an improperly secured lug nut and was fined $2,500.