I personally think they are noticeable and well more felt than heard. Idk how to explain it but the best way I can is it feels like something is rolling under my seat and hitting the back of my foot. Obviously I’ve checked and there is nothing loose under my seat that would roll and I looked under the car and didn’t notice anything caught up.
I am not sure exactly which one I am in when it happens, I believe it’s the gas engine side more than the electric side. And it mostly happens when the engine is warm. It usually doesn’t happen when I first start driving but after a bit it will.
On older cars, I'd think what you're describing could be worn CV joint/shaft, steering issue, suspension issue, or exhaust system heat shield (or maybe even a motor mount/bearing?). BUT it's hard to make the leap that your brand new car would have these issues already. You're covered by Honda's new car warranty and I think you should bring it in if you don't find obvious physical issues that were already suggested. However, you'd get better assistance and resolution from Honda if you can narrow down the type of issue and conditions under which they occur.
Since the issue as intermittent, it might help Honda diagnose if you can video the issue and/or document conditions when it occurs. If personal video doesn't work, suspension and alignment mechanics can use a set of microphones connected to headphones, where the microphones can be moved to suspect points and driven around while listening to zero in on the source of the noise. Or perhaps your Honda dealer would have something like this.
It might also help the troubleshooting to narrow down the engine condition under which the issue occurs. To determine whether you're in hybrid, electric, or gas (direct drive) mode, try having the "Power Flow Monitor" up on the infotainment OR on the drivers info interface. (It's available to view in both places.) Alternately, try some less-precise indirect estimators:
- if you see the green "EV" indicator in the lower left corner when the noise occurs, you're in electric mode
- if you see the dial on the left 'power/charge' circular indicator running in the 'gray' areas, you're in gas (direct drive) mode
- if you don't see the "EV" indicator and are running in the blue or green part of the 'power/charge' indicator, you're likely in hybrid mode (though it could also be in this condition for gas-only mode... thus the cross-reference suggestion to power flow monitor)