The No. 19 Joe Gibbs Racing team was dealt an L2-level penalty after last weekend's season-opening Daytona 500.
Following further inspection at the NASCAR R&D Center in Concord, North Carolina, NASCAR found modifications to the spoiler of the No. 19 Toyota driven by Chase Briscoe.
According to the NASCAR Rule Book, an L2-level penalty includes modifications to Next Gen single-source vendor supply parts and/or assemblies.
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JGR was found to be in violation of Section 14.1 of the Rule Book, which pertains to overall assembled vehicles rules, and 14.5.8, which deals with the spoiler. Specifically, the spoiler base was found to be modified on the No. 19 car. The spoiler base is a single-source part and cannot be modified.
Briscoe was docked 100 driver points and 10 playoff points.
JGR was fined $100,000 and deducted 100 owner points, as well as 10 playoff points. Crew chief James Small was suspended for four races.
Other penalties were also handed out after Daytona.
The No. 34 Front Row Motorsports and No. 51 Rick Ware Racing teams were penalized for a safety violation with added ballast to their cars.