Makes whining noise above 25 MPH

Hi Danny, hi Ken,

Thanks so much for checking in on my question. I really appreciate it. Finally, I was able to record a video of the sound. I've attached it for you here. Apologies for the delay.

Firstly, in response to Ken's question, while I can't definitively say if it's coming from the engine brakes, it certainly sounds like it's coming from the front of the car.

Just a couple of additional findings: I've discovered that when I keep the engine in neutral and start revving the engine, there is no out-of-place sound at all. Also, the sound doesn't seem to be initiated by my pressing down on the gas, but rather by the overall speed of the car. To clarify what I mean, I may be on the highway driving downhill and not pressing on the gas, but since my car is still accelerating due to gravity/momentum, the sound will get louder. As stated earlier, the sound amplifies with speed. Whether I'm driving with the A/C on/off and on Eco-friendly or not makes no difference.

If you can share any additional thoughts here, I would really appreciate it. Thank you guys!

Hi Joe, yeah I figured it would be difficult to tell, considering that there's no reference to compare off of. Here's another video of what the engine should sound like (or at least closer to a proper noise). In this video, I'm in park and pressing on my accelerator. If you watch and listen to the first video, you should be able to tell a distinct difference between the two. Again, the abnormal sound becomes louder as the speed of the car increases, not simply from pressing on the accelerator which you can do while in park or in neutral.

Hi Danny L, thank you so much for sharing your thoughts. I really appreciate it. I'll have to look into the fluid levels for sure.

Hi Danny and Joe, so I did finally get an update, after having dropped off the car to the dealership. So, I wasn't aware that with Honda Civics that you need to replace the transmission fluid every 30,000 miles. I'm at 80,000, unfortunately. I was told that the humming noise is coming out of my CVT transmission due to the fact that the transmission fluid has never been replaced. The very odd statement they gave me was that at this point I should not replace the transmission fluid, as it could potentially cause unforeseeable damage. Does that make any sense at all to you guys? I would've figured that I should replace it immediately.

Unfortunately, that's a level of detail that they never shared with me.

So, based on your comment, I'm interpreting that as "yes, replacing the transmission fluid at this stage could cause damage". Am I understanding you there correctly?