Oh1TypeS

So I posted before that my check engine light came on. I ran the codes, and it was P1456. The fuel cap was tight, and I don't hear any ticking from the purge valve.... but I did re-fuel the car without shutting it off....(it was 5 degrees out!)
Could this have thrown the code? I got gas, drove home, drove to work, drove home, then to work again, and the light came on the day after???

Never Summer

I've gotten a CEL because of shitty gas before, we checked everything, including the fuel cap, and a week later when we refueled it was off, and the car was running fine.