I have a 2012 Silverado 1500, 5.3L, 6spd and have an AutoCal from Blackbear. I have used the AutoCal many times on this truck to update tunes. Recently, I installed LT headers and like I always do, I logged a file and sent it to BBP. Once Justin sent the tuned file, it was saying it wasn't supported with this version. I went to EFILive.com and downloaded the latest version (v8.2.2 build 276), updated the firmware and everything was ok. I turn the key on to run in my truck, plugged the AutoCal in and the Fuel Guage starts swiping and the DIC says to service Stabilitrac System. The AutoCal says 0280. I know that code means it's not reading the truck. I'm completely stumped! I've never had this issue before! Any help will be greatly appreciated!