Hopefully you have made a full backup of the Mac before the EFI partition failed to begin with, otherwise you should complete a backup before attempting to reinstall MacOS system software. You can reinstall Mac OS X using any of three methods: using a bootable disk, using Internet Recovery, or using normal Recover mode, which approach you will probably depend on. It is not the most elegant solution, but reinstalling Mac OS system software should repair a broken or damaged EFI partition, or if one is missing somehow it will recreate one in the OS install process. I fiddled with the other options, but ultimately just reinstalling Mac OS system software did the job for the situation I encountered. There are options to attempt to manually rebuild, create, or repair the EFI partition, typically with fsck, diskutil, and third party tools like got frisk. Since a broken EFI partition may prevent a Mac from starting up properly it can be a challenge to repair. The EFI problem is then confirmed by booting into Recovery mode and running Disk Utility, often from an another drive. Though it is an unusual occurrence, a Mac may encounter a broken or damaged EFI partition which typically prevents the Mac from booting and the Mac OS system software from loading.
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