I have a 2009 iq shift 600 136". I stoped at a dead end and waited for my wife, shut the sled off. I then fired her back up and put it in reverse,turned around and hit the reverse button and when it switched into drive it said "service engine" and then went to normal readind. The sled ran great all day after I noticed this. Any ideas why it would say that? 250 miles on the sled.