Hey Guys,
I'm looking at having my ECM unlocked on my 2022 refresh Silverado with the Global B e90 ECM i believe. My Trans shifts fine but speedometer is 3-4mph off and so is mileage, etc.
Can I correct my speedometer with just unlocking the ECM and using the Gear/Tire wizard to update to my new tire size/rev count?
Or do I have to have the TCM unlocked as well and change something in there too?
Any help is greatly appreciated!