American Spencer Pigot won the title over Canadian Scott Hargrove in the final race weekend at Sonoma Raceway in controversial fashion.
In the second race, Neil Alberico, Hargrove's teammate, made contact with Pigot on the first lap, although both were able to continue.
On lap 12, Pigot's teammate Kyle Kaiser's car stopped on track bringing out a caution flag, allowing Pigot, who was running sixth at the time, to close up behind the leaders.
Andretti Autosport's top challenger, Shelby Blackstock finished fourth in the championship, also without a win.
American Bobby Eberle captured the Expert Class championship for drivers over 35 years old largely by virtue of entering the most races among such entrants.