HOMESTEAD, Fla. — Kyle Busch emerged from the Joe Gibbs Racing juggernaut as NASCAR’s latest champion, winning his second title Sunday after two teammates were slowed by pit-road gaffes.

Busch won the season finale at Homestead-Miami Speedway to snap a 21-race losing streak and beat Gibbs teammates Denny Hamlin and Martin Truex Jr., as well as rival Kevin Harvick, for the Cup. Busch won the 2015 title and joins seven-time champion Jimmie Johnson as the only active drivers with multiple titles.

“Ol’ two-timer out there,” crew chief Adam Stevens radioed. “I’m proud of you buddy.”

The 34-year-old Busch, somewhat subdued, simply thanked his crew. He’s the 16th driver in NASCAR history to win multiple championships, and one of only five to win titles in both the Cup Series and the second-tier Xfinity Series.

“Awesome job, guys,” he said. The No. 18 crew climbed the pit wall and handed Busch the championship flag for his post-race celebration.

He was met on the frontstretch by 4-year-old son Brexton, who immediately asked: “Dad, are you going to throw me in the air again?” about their celebratory tradition.

Busch had raced for a second championship in each of the last three seasons and fell short a year ago in part because of his crew’s own pit error.

This time, it was Truex and Hamlin bitten by silly mistakes. Truex dominated early but fell a lap back after his crew put tires on the wrong side of his Toyota.

“You’ve got to be perfect, one mistake probably cost us the championship,” Truex said.

Hamlin fell out of contention when a crew member placed a piece of tape across the front of his car that caused his engine to overheat and Hamlin had to make an unscheduled pit stop.

Truex recovered to finish second, but Hamlin didn’t have enough time to overcome the miscue and was a disappointing 10th.

“I feel like I did all I could. I don’t feel I could have done a better job. I didn’t leave anything out there,” Hamlin said. “I was thinking we got a chance and it just didn’t work out. We got a little aggressive there and it cost us.”

Harvick, the only Ford driver in the championship field, never had anything on long runs for the Gibbs cars and finished fourth.

“On the restarts I could do what I wanted to do and hold them off for 15 or 20 laps,” Harvick said. “... They were quite a bit better ... on the long run.”

The finale pitted a trio of Toyota drivers from Hall of Fame owner Gibbs against Harvick, the hand-picked driver of former Gibbs protege Tony Stewart at Stewart-Haas Racing.

Busch was considered by many the least likely contender of the group. Although he won the regular season crown, his last Cup win was at Pocono in June, and his playoffs leading into Homestead had been mediocre at best.

Hamlin, Harvick and Truex had all won playoff races. Hamlin is the only driver in the final four without a Cup.

“Everybody always says you never give up. We’re no different. We just do what we can every week,” Busch said. “Sometimes we may not be the best, ... may not have the right track position. We had a really good car, and I could race around and move around. That’s what’s so special about Homestead Miami Speedway, is the ability to put on a show.

“I felt like we did that there racing those guys. I know it kind of dulled out toward the end. It was exciting enough from my seat. It was a lot of fun to cap off such an amazing year.”

Busch gave Gibbs his fifth Cup, and Toyota its third drivers’ championship in five seasons.