Rahal Letterman Lanigan Racing entered three cars for the 2022 series – for Graham Rahal, Jack Harvey and rookie Christian Lundgaard. Rahal drove his usual #15 car backed by United Rentals. He scored no wins and no podiums, with his best performance at Toronto (4th place) and finished the season 11th, first time since 2014 out of top-10.
|Graham Rahal||15||Rahal Letterman Lanigan Racing|
|Dallara DW12 (IR18)||Honda||United Rentals|