Why is my Subaru Outback making a faint whirring noise while coasting?

[William_H]

Hey folks, hoping someone can shed some light on this. My 2016 Outback has started making this faint but persistent whirring noise from the front end when I’m coasting between 30 and 40 mph. It’s not the brakes or the wheel bearings, at least I don’t think so, because it completely disappears the moment I touch the accelerator or the brake pedal. It’s got me wondering about the transmission. Anybody had a similar experience or know what I should be listening for next?

[Kenneth51]

That sounds frustrating and a bit worrying. In a 2016 Outback the CVT can make a light whine in the transmission when the load shifts during coasting around 30 to 40 mph. It might also be a belt driven accessory or a loose heat shield. Best to have a shop listen to it while you reproduce the condition so they hear exactly what you hear.

[Victoria_G]

Could be less dramatic than it seems, maybe wind or a loose shield rather than a failing transmission. A tire hum or a small rock in the wheel well can show up only when you coast. Check tire pressure and tread, and take a quick look at the front heat shield and any trim pieces in the wheel area.

[Mark89]

One way to sort signal from noise is to test with no load. Put the car in neutral and coast at the same speed to see if the sound stays. If it disappears in neutral the issue is load related rather than a pure transmission thing. Also check the transmission fluid level and color when safe to do so.

[Zoey9]

Perhaps the frame of the problem is wrong and this is a normal deceleration sound for a CVT in that model. If it only happens on certain road surfaces and goes away with throttle, it may be a resonance rather than a fault. Still worth a quick check of the front end components.

[Oliver13]

Not every noise is a failure ready to fix today. A mild whine tucked in during deceleration can be a normal characteristic for many cars. If it starts to get louder or you hear scraping or vibrations, get it checked. But for now it may be nothing more than a quirk.

[Steven.C]

What if the sound is really a tire or wheel issue masquerading as something front end related. A wheel balance or worn tire can sing a quiet note at a certain speed. A quick road test with a passenger listening carefully could help.

[Gary47]

If you want a question to test your framing you could ask if this is something you should fear or if it is simply a signature of that transmission type. What if the sound is a normal CVT wear sound that many owners accept would you still worry or prefer to confirm with a pro?