I think I have the same issue that this thread is discussing. When I go over bumps, I hear a rattle somewhere in (or in front of) the dash.
Here's all the information I can contribute:
1. The rattle has the hefty, resonant sound of metal on metal. I don't know 100% that it's metal, but it's definitely not a couple of small interior plastic parts rubbing on each other.
2. I can hear it from 2 distinct locations: one sounds like it's in front of the driver, the other sounds like it's in front of the passenger. I have heard it repeatedly from these same 2 locations. and never from anywhere else. This implies to me that it is some part (or pair of parts) that is symmetrical across the centerline of the vehicle.
3. Both locations don't always make noise on the same bump; it's often one place or the other making the sound. I haven't been able to tell if the sound comes from a different location based on which tire hits the bump (e.g. if the front-left tire went over the bump vs if the front-right tire).
4. I don't think the problem is the glove box rattling mentioned elsewhere on this forum for the following reasons: (1) it sounds too far forward to be the glove box (2) it occurs on the driver's side (3) it sounds too hefty to be plastic on plastic.
5. I don't think it's the RPM-based sound mentioned in TSB 17-054 because it never happens when idling without moving the vehicle. It's definitely caused by going over bumps.
6. The rattling seems to be more frequent in cold temperatures. The temps have fluctuated back-and-forth between 60F and 9F over the last couple weeks, and the noises are much more frequent in the cold and almost non-existent when the temps are high in that range.
7. Once the issue began happening (about 3 weeks ago), it has happened quite regularly and repeatably. Put another way, the problem had a quick and obvious onset; it didn't start slowly over time. However, now that the rattle has started, it slowly comes and goes based on temperature (as stated above). This implies that something came loose or otherwise changed positions, and is now thermally expanding/contracting to contact a nearby object.
I don't have any meaningful solutions or troubleshooting suggestions, but hopefully my experiences can help us collectively diagnose this issue.