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CVT clutches drive on the sides of the belt. The clutches should be smooth or you'd get severe belt wear . As the belt wears it gets narrower and you would see glazing on the sides.. Evewntually when it gets narrow enough it in unable to ride up in the clutches properly and you lose speed and grip

Your revs going up and no drive power to the wheels was because your CVT transmission belt and clutches got wet. It doesn't take a lot of water entering the housing and wetting the belt to make it slip . CVT transmissions drive on the sides of the drive belt .. Since the clutches are smooth, they lose grip on the belt when wet ..As soon as the clutches and belt start drying they regain their grip. A worn belt will slip much quicker than a new one since it is narrower due to the wear on the sides as it is used. Definitely check all the fluids for water that may have entered through the various vents on the differentials, transmission and motor.

An 18 volt reading is too high, normal is around 15 volts. Most likely cause is the regulator is bad. Charging the battery at that voltage will damage it Mike

Hi Al, I've got an '09 sportsman/500 efi with a plow and I was getting the same "check engine" warning that you have. Check your oil level and change if necessary, as per your hour meter. When you're plowing, it's hard work for short bursts and then nothing then short bursts again. Your oil is hot and not cooling properly as you're not travelling any distances (like trail riding) to cool it off. If you're down even a half pint, that makes the motor work even harder, hence the warning light. Either slow down on the throttle or take more frequent rests and the light will not activate. When you put it in the garage, the motor had a cooling off/rest period and the light went out.This worked for me. Doug, www.northland-paradise.com, Temagami