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Loud sound when driving at certain speeds - civic hybrid

Hello, I have a 2006 civic hybrid.

The issue is a loud humming/rumbling (not really a rumble though) sound that seems to emanate from the engine are when i’m going certain at speeds from 40-65mph. Above 70mph it goes away. Also, even when i have have my foot off the gas pedal it persists.

I’m going to have it serviced at the dealer this Fri, but I wanted to see prepared ahead of time to see if anyone knows about this.

It started about 2-3 weeks ago… I didn’t notice it at first as I was driving a company car for awhile so I wasn’t sure if it was due to just the differences in the car, but now i’m sure it’s abnormal.