FONTANA, Calif. -- Tom Logano was back at Auto Club Speedway on Sunday to watch his son race in the Pepsi 500 a day after having his credential pulled following a run-in with Greg Biffle.

Tom Logano confronted Biffle at the end of Saturday's Nationwide race -- a race his son won -- after Biffle nudged Joey Logano into the wall while passing for the lead on Lap 50 (watch video).

Biffle hinted at the manuever shortly before it happened, a move that apparently angered the elder Logano. While his son celebrated in Victory Lane, Tom Logano approached Biffle's car as he pulled off the track and made at least one hand gesture during a short verbal confrontation.

A NASCAR official then pulled Logano's credential. He met with both Nationwide and Sprint Cup series officials following the incident, NASCAR spokesman Ramsey Poston said.

Tom Logano was able to attend the race after applying for a single-event pass. He had the pass tucked into his shirt pocket while talking to Joey shortly before the race but had no comment on the incident as he made his way to a viewing box above pit road.

Joe Gibbs Racing president J.D. Gibbs said Tom Logano was apologetic while talking to team officials.

"There was an issue on pit road and NASCAR addressed it," Gibbs said. "He went and talked to the guy at NASCAR [Nationwide Series director Joe Balash on Saturday]. When I talked to him, he was contrite and apologetic and he said he messed up on it."

There was no drama between the two camps during Sunday's race even though they were side-by-side in the pit box.

Joey Logano finished 14th, while Biffle was 20th after a late collision with Kasey Kahne.

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