The No. 18 Joe Gibbs Racing team with driver Kyle Busch was the only NASCAR Sprint Cup Series team issued a written warning following Sunday's STP 500 at Martinsville (Va.) Speedway.
The team failed the Laser Inspection Station (LIS) twice during pre-race inspection on Sunday. Teams requiring three or more passes before being cleared by inspectors receive a warning from NASCAR.
Busch won the race, the sixth stop on this year's 36-race schedule, leading 352 of the 500 laps contested.
It is the first written warning for the No. 18 team this season.
In the Camping World Truck Series, which also competed at Martinsville this past weekend, the No. 22 AM Racing entry of driver Austin Wayne Self received a warning for truck trailing arms that did not meet NASCAR specifications. The infraction was discovered during opening-day inspection on Thursday.
Both penalties were announced Wednesday by NASCAR.
Self failed to qualify for the Truck Series race, but competed in the No. 44 of Tommy Joe Martins after Martins damaged his primary entry in qualifying and the team did not have a back-up for the race.
Failing inspection twice, either pre-qualifying or pre-race, results in a written warning. A third failure will also result in the loss of 15 minutes of practice time.
Teams receiving four warnings forfeit the opportunity to select a pit stall, either for the event in question if selection hasn't taken place or at the next event if pit stall selection has been completed.