alright all you tuners out there got a speedo problem just like it seems everyone else does on here that change tire size and in researching all of it I still see no real fix? Case in point 08 Silverado 4x4 changed tire size (smaller) all the way around (same size tires) try and correct speedo cal and boom... abs/brake light on. like most I notice that when you change (or correct) for speedo cal it only changes the "rear" speed signal. now I know that the front abs sensors are calibrated in the EBCM. So... how exactly is this signal changed? obviously my fronts are reading fast (smaller tires) when I change PPM to reflect the new tire size trans shifts as normal rear speed matches gps but guess what...warning lights. I can tell you that a tech 2 "CANNOT" change this calibration. I have the latest software from HP Tuners and in general under speedo I see no tab that allows me to modify MILES-ABS. must be for older OS? its not there. what's the real fix so my speedo, 3 wheel speed sensors, and GPS all says the same.
something this trivial has me pulling my hair out
ps. I tried modifying just about every table in general with no luck gear ratios,etc... no luck
thanks
'one frustrated tuner'