I started the car the stood behind it a few feet while I smoked a cigarette. I heard an intermittent click sound. It was every 10 seconds or so. Then I got in and saw the check engine light turned on.

so I scanned it and this code came up. Seems like it's an exhaust flapper.

do you know more about this? I guess I can keep driving.

This probably isn't the case, but sometimes when an actuator doesn't fully complete, it may try repeatedly to complete its task. Then give up.

Do you have Sport exhaust? Does the sound change?

Someone else might have experience.
Good luck.
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Here's the crazy thing. It doesn't have the sport exhaust.

What was the outcome? Mine just came on this morning. 2022 GLE450