I'm running an '06 LGT that just hit 50k - no mods ('cept K&N) or abuse.
The same day the issue started, I went to the local gas station to fill up before going home from work. I fired it up after I filled up the tank and the CEL/Flashing Cruise Control and ER HC error in the ODO had cleared itself. Strange stuff. Happy I didn't have to drop a large chunk of coin for a diag and a mystery repair.