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Same problem here with multiple 3660 machines.

Same issue here, on two identical and fresh out-of-the-box 3660 systems (the first of this model).

BIOS Version 1.7.1

Command monitor 0.8.0.284, A00

All drivers up to date

We are in contact with dell support. 

Support replaced the motherboard but this did not solve the problem.

Affected ambient temp sensor is also visible in BIOS and healthy (green, 25C) as it was before.

We tried downgrading the bios to 1.6 and even one previous ones, tried different command monitor versions but nothing solved the problem.

This definetly looks like an issue inside dell command monitor, maybe it does not have the correct parameters for the new hardware.

I really hope this gets resolved quickly

I logged this problem via the Dell TechDirect site on 28 October 2022.

Last response was on 23 Nov 2022

"Our engineer team able to replicate the issue in their lab system. They have engage the BIOS team to work on the solution."

BIOS update 1.7.1 released on 11 Nov 2022 does not fix this issue.

BIOS version 1.2.48 doesn't appear to have the issue when I tested it with my system.