“03 700 Sportsman will not come out of diagnostic mode…

Hey guys, I bought an 03 700 a few weeks ago and have been lurking here to find info to fix it, shes running pretty good but I have a problem. The speedo is always in diagnostic mode and since tonight the speedo stays on and the and the needle is blinking, even with the key shut off. I just disconnected it for tonight but would like to resolve the problem asap. Everything seems to work on the bike AWD, lights etc, I’m thinking maybe a ground problem.