So there is a recovery system for the fuel vapors that goes through a solenoid on the engine. When malfunctioning, it triggers a check engine light and will cause your car to flood after fueling up. Same thing happened on my 2007 Avalanche, except the Caddy nearly got me run over a couple times stalling after I fueled it up. I went and got the part to fix but, screw it. Traded it in on a Toyota Highlander.

Screw General Motors and their engineered systems that are designed to go out after the warranty is expired. After the headlights or lack thereof almost got me run over, and the stupid Cue screen locking up, lost my butt trading it off and was never so happy that I got rid of it before it killed me. Screw GM!