po 297 ( speed overdrive detection) I just installed the 300 hotdamn tune on my 2008 job2 . I checked and cleared it but is this something i need to look in to i never had a problem or a check engine light after i installed the tuner for 1200 miles.
I don't know 6.4s but is that a turbo overdrive or vehicle speed? What were you doing when the light came on