Got a CEL.

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

is that the first time you went over 100mph? LOL total guess

can you select tire size with that tuner? if so what did you put?

it"s a H&S tuner and now it won"t go in to fifth gear . I've haven't been over a hundred MPH yet but I have been driving it hard . From what I've read on here I think it's a shift soleniod( I think I spelled that wrong) but I'm not sure please help me . BTW I put it at 36" when the tuner asked because my 37"s are kind of worn.

Oh I forgot to mention when it shifts into fourth it revs up two or three times then it shifts into fourth.

cfdeng7 said:

I don't know 6.4s but is that a turbo overdrive or vehicle speed? What were you doing when the light came on

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I hammered from a turn going about 35 MPH.

Did it slip or something and over rev?

It reved up when it was supposed to shift into fourth so yeah i think it was slipping . When it did shift into fourth it didnt slip at all