My 2019 pilot with apx 8k miles on it has a funny noise on startup. It's probably normal and wouldn't be a problem if the car was used often. Recently the car has been sitting for a week or more and quite often it has a sound like a growl immediately on startup. I assume it is something being charged up, it seems to be coming from under the car toward the rear. I mentioned it to my dealer but they couldn't reproduce it, of course. Just wondering if anyone knows what it is.