I own an '09 NAH. It currently has approx 33,500 km (20,815 miles) on it.

Over the past week or two, I've noticed a noise coming from the car when I'm driving at city speeds (50km - 60 km/hr/30 - 35 miph). It sounds like a "whirring" noise and is there whether I'm in Hybrid mode or gas mode.

I've owned the car since brand new and it seemed really quiet when I'm driving in ECV mode. Now I'm hearing this noise and am a little concerned. As mentioned, it's there whether I'm in ECV mode or not.

Would anyone have any ideas as to what it might be? The car's still under warranty, so that's not an issue, but I would like to have an idea as to what it might be.