I'm not on the form much but Welcome (that may be a good thing, no truck problems
). I have an LBZ aswell and I get that code once in a blue moon (maybe 2 times a year) dug in and diagnosed it changed the sensor, cleaned the vanes as best as possible and came back with nothing and even brought it to a GM shop and talked to the tech after and it seems to be one of those codes that pops up randomly due to sensitivity. I just clear it and get on my way.
IF the truck runs rough or out of wack then you'll have to dig in and figure whats going on. Good luck!