Sowega6.6
April 12th, 2026, 02:31 AM
I recently bought a 2011 silverado 2500 ltz duramax. I have an efi autocal with four different tunes on it. I cant do anything with the autocal but read and clear codes. Any time i try to change tunes, I get an error code $0502. Anyone ever run into this? I'm not sure what tune the truck is currently running and I have a trip coming soon where I'll be pulling my camper so I'd like to make sure I'm in the lowest power tune before I go. Thanks for any help.
Dusten.
Dusten.