I have a 2019 MacBook that is running kerneld at 1000% CPU (yes 1000%) no matter if I boot the OS or even into Recovery Mode. However, when I boot into Recovery Mode with Command R I can also hear the fan running full speed, and the system is very non-responsive. This makes me think it isn't an OS issue, it is something about the firmware boot.
I erased the NVRAM with CommandOption R R and still no change.
I booted into Target Disk Mode by holding down T so I can copy some files off it before a complete reinstall, but even that is running the fan hot and the machine never shows up as a disk on the other laptop.
Update: I also note that even with the device completely shut down it will not charge the battery.
I am at a loss as to next steps short of return to base. Any ideas?