I was updating (CU) a node of an AG, this was an Asnc copy in a different subnet than my production copy. SQL 2012 SP1 EE.
I tried upgrading to 3 different CU's. Each time it showed the database engine failed, however SQL showed the new version, and in the SQL Logs I see the upgrade scripts running.
Error from log
There was an error to lookup cluster resource types. Error: There was a failure to call cluster code from a provider. Exception message: Generic failure . Status code: 4104. Description: .
Error code: 0x86D80018