RPM is currently evaluating several driver opportunities to help drive the No. 9 team forward and will make an announcement at the appropriate time.
Richard Petty, co-owner of Richard Petty Motorsports, expressed thanks to Ambrose for his dedication to the team.
"Marcos will always be a part of our extended racing family," said Petty. "He came over to the United States with his family and dedicated his time here to giving it the best he had each week. I couldn't ask anything more from Marcos and his commitment on and off of the track to our race team and our partners. Away from the track, he's a family person first. That's something I respect and we'll miss Marcos, Sonja and their children."
Ambrose will depart the team as one of the most successful drivers to ever race under the Petty banner. He is recognized as one of the best road course racers in NASCAR history, most notably at Watkins Glen International, where he has six NASCAR wins.