Cat 315CL

Good morning my fellow dirt enthusiasts. I was hoping for some guidance on a active code I have on a Cat 315CL CJC04630. The code : 1162-3 high voltage rear hyd.pump pressure sensor . Does this simply mean it needs to be replaced or should remove my head from that dark warm place and cash in the 401K.? When digging now the hydraulics seem to have that echoey whine. Thanks in advance for any help. P.S- Both filters are new Cat Brand filters, proper type and amount of hyd, fluid.