Does anyone know how to make the Speedo read correctly?
I change the VSS for the ECM under the speedo tab and it doesn?t make a difference.
Does anyone know how to make the Speedo read correctly?
I change the VSS for the ECM under the speedo tab and it doesn?t make a difference.
In the 6.7's, you have to use Forscan and program the BCM for tire size. The rotations per mile is limited to about a 35" tire. I'm guessing it's similar on the 6.4 trucks.
https://forscan.org/forum/viewtopic.php?t=15994
Thank you for the help, I did find it in FORscan, but for the 6.4 trucks it?s in the ABS module.
However it would not let me change the current tire size, when I go to implement the change it gives me some weird error message saying the data is not compatible or something to that effect.
Do you think if the tire rev/mile setting in the ABS module is outside of the min/max tire rev/mile setting in the ECM file under the speedo tab it could be causing this?
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