Carpentier has secured a ride with RAB Racing at the upcoming NAPA Auto Parts 200 NASCAR Nationwide Series race on Aug. 18 in Montreal.
The Joliette, Que., native won the pole for this race in 2007 and posted second-place finishes in 2007 and 2008. The last three Montreal races saw Carpentier as one of the fastest on the track before mechanical issues or an accident ended his races early.
"The Montreal race is my Daytona 500," said the 40-year-old Carpentier, who has led 14 laps on the 2.71-mile road course. "I know I said last year would be my final race, but I'm a racer. When they called and asked if I would run Montreal again it didn't take long for me to answer.
"I've said many times that winning in Montreal would definitely be a highlight in my career. Moreover, this year's race is different, because my participation will benefit the Montreal Sainte-Justine UFC Foundation."
Carpentier has started 15 Nationwide and 39 Sprint Cup races in NASCAR after winning five races and reaching 22 podiums on the now defunct CART open-wheel circuit.
He also won the Formula Atlantic championship in 1996.