What are all the fixes you tried?
Tried this?
Reset SMC How to reset the SMC of your Mac - Apple Support (this one should do the trick)
Reset NVRAM Reset NVRAM or PRAM on your Mac - Apple Support
Restart holding Shift to enter Safe Mode. Once loaded, restart normally and check again.
Also restart holding D to enter Diagnostics Use Apple Diagnostics to test your Mac - Apple Support and run it to check if any thermal sensor has died.
For help with Diagnostics Apple Diagnostics reference codes - Apple Support
Do you use any controller app like Macs Fan Control? Are you using any antivirus or gadget app like Clean My Mac or any trash like this one? If you do, remove them, restart and check if anything changed.