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It is a focus by wire system, so it appears that something is broken inside.
Sometimes it seems that it takes a while to wake up the focus system, in other words, it might take a few turns to get any movement at all. Did you try that?
Are you trying when the camera is in focus/exposure mode just after you half press the shutter button?
I grabbed my 135 f2 L lens and manual and auto just quit working! No explanation why. My favorite lens!
I sent it in and the wanted $600 to repair it. OMG. I have a 100mm f2.8 that just the auto focus quit working. They want $325 to repair it. What is going on with canon lenses???
I had the same problem with my 18-135 IS STM. The lens acted like it was still in AF when I switched the button from AF to M. I changed AF methods in the menu from FlexiZone to Quick Mode, and the problem went away. Oddly, when I then switched back to FlexiZone the lens continued to work in both manual and auto focus.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.