Yes, it's there. And it's screwed in.

Why does this message keep popping up on my info center when I'm driving? It happened yesterday, so I pulled over in a parking lot and checked to make sure the cap was screwed in place. It was, so I restarted the car and pushed the reset button to turn the message off. Then this morning on the way to church it came on again, and I jabbed the reset button and continued driving.

I have maybe 1/4 of a tank remaining, or an estimated 130 miles 'til empty.

What is the deal!?