Twice now I have had my 2004 Odyssey demonstrate this problem. I would turn the van on, and my display doesn't show a light for what gear I am in. It should show park of course. It also won't let me put it into gear just as if the van is off. Rocking the van forward and back has fixed it the last few times. Specifically when I rocked the van backwards the "P" for park would light up, at which point I could also put it into gear and then the van functions normally after that. I have 104,000 miles on the van now. Anyone have ideas or theories I could test out? For now I am putting the Ebrake on every time I turn it off just incase it helps by not allowing it to move while parked.