I have a 2016 silverado 3500hd that I am learning how to use hp tuners on, and I am having trouble under standing why when it goes into pe the commanded afr does not change as it does on all of the other vehicles that I have connected it to. I do not have a wide band yet but plan on getting one soon as we are planning to put a cam in this truck after I get the basics figured out. Could there be something wrong with the truck or am I to blame? Any help or ideas would be greatly appreciated.