Speedo recalibration

[LIL DAVE]

Moderators feel free to move if not in right section

I have a 2008 3500 hd diesel and i have an issue why is my ABS/BRAKE light stays on when i recal the speedo.....is their a magic number tire height that i have to enter so those lights do not to come on my speedo is readind 5-8 mph off oh and by the why the factory tire height was 225/75/17 to a 255/70/22.5 which is 36.1" tall

David

[Dmaxink]

hey bud, if there tire size is over 35" this typically happens. I dont know really why but the ecm just does not take that tire size when we have tried to program it. it will take 35s but not anything over...at least in our cases.

hope this helps!
-Kory

[minytrker]

I think its a hard limit in the pcm.