I have gone around in circles on this, but using PowerCLI I cannot find a way to change a vmkernel NIC's port group AND IP at the same time (actually trying to change to DHCP, but same problem. It seems if you need to change the port group the option to change anything about the IP is not available. So, there is no way to fix this without using a IPMI remote console it seems.
Any suggestions would be appreciated.