Luhr, 34-year-old, will join forces with squad regular Josef Newgarden at the California road course.
The German confirmed that his ties with Honda Performance Development, which is involved in his ALMS programme with Pickett Racing, was the decisive element that helped him secure this drive.
In order for him to get accustomed with his new mount, Luhr, who has driven single seaters in the past, will get two days of testing at the Sonoma Raceway ahead of the race.
He also said that he would be interested in contesting a full programme in IndyCar in the future.
|Photo: Sarah Fisher Hartman Racing|