5D Not autofocusing

My 5D just started acting up. The body will not activate any attempt to focus when pressing the shutter release button halfway. It's not the lens as it acts the same with all my lenses and the lenses focus fine on my other bodies.

When I change the focus to the * back button the 5D focuses fine with all the lenses. So my conclusion is the halfway depress function of the shutter button to initiate focus is no longer functional. I'll have to take it into Canon for repair (it still needs the mirror recall replacement done anyway).

Anyone else run into this problem? One minute I had AF, the next there was nothing, relegated to either MF or back button.

Have you got your custom functions (C.Fn IV) set properly, you need to set it back to "0" metering + af start.

Yes, it's set properly. When CFn IV is set to "0" pressing the shutter button halfway does not activate AF, that's my problem - it should.

Does the metering start when you press halfway?

If the metering starts, it's probably not the switch.

Good question, I don't recall and don't have the camera with me to check. I'll try it tomorrow and see if the metering starts. Thanks.

this exact issue is happening on my girlfriends 5D as well.

lannes wrote in post #11035971
Have you got your custom functions (C.Fn IV) set properly, you need to set it back to "0" metering + af start.

just went downstairs. this fixed it. not even sure how that got changed. thanks!

Update:

So I checked this morning and metering started but the button would not start AF in the C.Fn. "0" setting. I removed the grip and the clock battery and left it overnight. I just reinstalled the clock battery & the grip and the AF now works in C.Fn. "0". All I can think of is there must have been some glitch that froze the AF operation with the shutter button but still allowed AF from the back * button.

Strange but there's no rush for Canon to service the body, though it'll go in over the winter for the mirror recall service.