Thanks guys! My dealer informed me that hitting select while viewing current codes will give a more detailed description. Throttle position sensor (out of range i think) is what comes up. It's happened a couple of times in the last 20 hrs, I think when I bump throttle dial down then up quickly checking to see that im at max throttle. Machine throws code then idles down. Only way to reset is to shut down and restart as far as i know. Overall this machine is a beast, the biggest Ive used (rented 450, 550 and a D3) so far. It's perfect for ranch work: brush clearing, roadwork and cleanup.