97 Ram1500 fault code P1757

I have a 97 Ram 1500 x-cab 4x4 that every time I go play in the mud and put it in 4 wheel drive, the next day I get a check engine light. According to a SnapOn scanner it is code P1757 - Governor Zero Pressure Malfunction. Can someone please explain this code to me and tell me maybe how to fix this problem. Thanks in advance for any help I can get.

I did a google search on P1757-Governor Pressure Pressure Malfunction. Lots of entries. Here's one, look at line 8E you need pdf reader.

http://www.allpar.com/fix/2001-codes.pdf

Thanks jrmcx. That helps, but I am still unsure of how to fix it. Is it as simple as doing a filter/fluid change or is it something that only a trans shop can fix. Anymore ideas on this?

Sorry I have no more info, but I did read somewhere when I was looking on internet for your error code it could be bad sensor