I've been able to isolate the noise and now can demonstrated at will.
I know with the multi-link rear suspension there could be any number of possible explanations.
But I think it is related to shock tower mounts.
It sounds like it's coming from the upper trunk area.
The suspension takes a set in relationship to the body.
When there is an inertial change there's a clunk.
Driving through an empty parking lot at 3 to 10 mph a quick turn to the left will cause a clunk. A second quick turn to the left does nothing. A quick turn to the right causes another clunk. And another click turn to the right does nothing. But then a quick turn to the left causes another clunk.
I have an appointment at the dealer in Waco Tuesday morning. We'll see if they can find it and solve it after I demonstrated for them.
Although the noise is in the trunk there's nothing that could be seen from within the trunk.
We Will find out how good of a diagnostician I am but I believe it is the upper shock mounts.
It be pretty tough to get a gopro up there under the chassis. And I don't think there's enough movement that it it would be visible. Just enough to make a clunk.
Tuesday I'm going back to the dealer, about an hour and 1/2 drive, for them to check it out. If it is what I think it's unlikely they will have the part. They don't seem to have K900s in their inventory and they've only sold four CPOs in the last six months. So that's the bad news.
But there's good news!
If it is what I think, it's the same part used in all of the 2009 through 2014 Genesis sedans and the 2012 and 2013 Equus. There is a Hyundai dealer in the same town that will probably stock that item.
I'll update you on what we finally find an what the solution is.
Sure sounds like something came loose or got stuck down in some where. That is why it clunks to the left then not again till you turn right. Could be anything from a nut to some thing got pushed in the side of the back seat by a child.
I took mine in and the dealer thought it was coming from the trunk, but they didn't have time to spend enough time to narrow it down - but they heard it and documented it. When I can be without my K900 for a bit, they will take it back to see what they can find.