Cisco UCS C220 M3 showing 0°C on temperature sensors, fans going full speed

I'm an Industrial Systems integrator, and we have a test server that houses some VMs on ESXi that we use as a test bed for some of our software and system development.

The other day I came in and the UCS was just screaming with all fans going full blast. I get into ESXi and look at the Health status page and it shows that basically NONE of the temperature sensors are working anymore, and all read 0. From what I've gathered, the lack of real sensor data makes the fans go full speed to make sure nothing is hot.

I'm assuming some central sensor component isn't working instead of one individual sensor, since they all failed.

My question is, is there a cable that could be loose or anything I can physically troubleshoot this with?

I've done some googling around first for quite a while to no real direction. I don't think we've got CIMS on this server, and I'm not super familiar with UCS servers in general, so please keep it dumb if possible. Cisco's documentation on this doesn't seem very helpful on where certain things are on the motherboard apart from the obvious stuff. Nothing I could find mentioned much about temperature sensor failure troubleshooting, especially when they ALL go out.