I'll get back with codes when I get a chance. Second time this has happened, identical situation, looks like a pattern. I filled up my tank in evening, drove 1 mile to hotel, parked my truck. The parking space is about 10% sloped, my nose is down. Next morning, I get CEL, which cleared the last time I had it (about 5 restarts I believe). I know the fuel vent system will set off the CEL (loose fuel cap for example). Anyone else experience this?