If you have [check key] come up on your digital readout sometimes, get a new one. My 08 xp has had this problem from the day I picked it up. My dealer [RMS] told me that was normal. The bad DES cap failed 15 miles from the truck. I have been playing with clutching for 1300 miles to try and get RPM to hold 8200 with out much luck. I changed the DES cap and now it runs 8200 RPM and holds. It is a different sled now.