X-2 SS Check Engine Light

New to the Mastercraft family and having some issues with a check engine light. I have a 2006 X-2 SS with a Crusader 5.7 with a Hurth transmission. I have read the fault code and it is DTC 81.

I have checked the raw water impeller and it looks new, there was a lot of debris in the raw water strainer, but I cleaned that out and I am still getting the check engine light after I clear the code. The raw water pump seems to be running well, it's pulling about the same velocity as a garden hose.

Can someone please point me in the right direction, the nearest mastercraft shop is 2.5 hours away.

Thanks.

Also, the engine is not overheating and running at 160 constantly. Oil pressure is operating between 50-65psi.