Brad Keselowski posted the fastest lap in the final practice session for the Xfinity Series Thursday at Charlotte Motor Speedway.
After posting his fast lap, Reddick brought out the caution when he got sideways and slid through Turn 4 before stopping near the entrance of pit road.
Jamie McMurray ran the most laps with 42.
Kyle Busch was fastest in the first of two Xfinity practice sessions Thursday at Charlotte Motor Speedway.
Busch posted a top speed of 181.371 mph around the 1.5-mile track.
He was followed by fellow Cup drivers Brad Keselowski (180.126 mph) and Chase Elliott (180.108).
Elliott is making his first start in GMS Racing’s No. 23 Chevrolet in substitution for the suspended Spencer Gallagher.
The top five was completed by Daniel Hemric (180.066) and Cole Custer (179.820).
Chase Briscoe, who was 10th fastest, recorded the most laps with 38.
Keselowski had the best 10-lap average at 178.763 mph.
Vinnie Miller had a hard impact with the wall in his No. 01 Chevrolet, but was unhurt.