On lap 134 of the Cup race at Michigan International Speedway, Ty Dillon ran over a piece of debris on the backstretch. The damage to the undercarriage of his car caused Dillon to hit the wall hard.
Dillon got out of the car under his own power and walked to the ambulance for a ride to the infield care center.
The debris disintegrated, making it difficult to tell exactly what it was originally.
“It was either a battery or a chunk of lead, which is really unfortunate,” Dillon told NBCSN. “When you’re going that fast, you don’t realize until you hit something and it goes through your oil cooler and you have no control of your car.
“We brought a better piece. We were running stronger all day, which is a good progression for our team. To hit something of someone else’s doing to ruin our day is unfortunate. And on top of it, it was a pretty hard hit.”
Dillon will score his worst career finish of 38th at Michigan with this retirement. His previous worst result was a 24th in spring 2016.