cant make changes to speedo cm2200 12 ram

[ronnyenns]

Hi
Im new to this forum and hp tuners so thanks in advance for your help...

been trying to calibrate the speedo on my 12 ram diesel and all the changes that i make makes no difference, tried VSS and also different gear ratio, i have 33' on it and its about 4 mph off, another thing i noticed is why cant i access DTC's?

[Engineer@HPT]

Hi
Im new to this forum and hp tuners so thanks in advance for your help...

been trying to calibrate the speedo on my 12 ram diesel and all the changes that i make makes no difference, tried VSS and also different gear ratio, i have 33' on it and its about 4 mph off, another thing i noticed is why cant i access DTC's?

I believe the speedometer adjustment is done in the BCM on this application. We'll be looking into adding the method for it.

[sasdakota]

ronney, The gear ratio and tire size adjustments mapped in PCM are for logic calculations like gear rationality, etc...