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Old 01-06-2006, 04:53 PM   #1 (permalink)
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OK, here's my pet peeve with my Sonata (which I really like otherwise).......

When I'm driving at a certain speed (usually between 65-70 mph), my 06 Sonata GLS V6 develops a really soft (but really annoying) high-pitched whine that decreases when you take your foot off the gas. Not much at other speeds (sometimes it will kick in real quick at high rpm before the automatic trans shifts), but when the car hits 66-67 mph that little subtle whine kicks in. By 75 mph, it's gone (thank god I drive 75+). Sounds just like a high-pitched dog whistle.

Not a wind noise....sometimes it sounds like it comes from below me, sometimes it sounds like it's coming from the dash. Dealer don't hear anything (of course), even when I'm in the car with the tech and can hear it (maybe I'm part dog.....who knows).

Here's my guess.......I think that it's the electric fuel pump. Sometimes if I'm outside the car, I'll hear a whine back in the fuel area that is almost the same pitch as the whine I hear at 70. Since the whine varies (or disappears) with engine rpm and application of the gas pedal, my thought is that I'm hearing the fuel pump hit a certain pitch, which causes the whine.

Anyone out there have this problem with their '06 Sonata?
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Old 01-08-2006, 01:03 AM   #2 (permalink)
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Doubt you'd be able to hear the fuel pump at 75+ mph over road noise, but it's possible.

Have you checked the front grille area for debris that could be causing a "whistle?" Just a thought...

Rob
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Old 01-08-2006, 05:46 AM   #3 (permalink)
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My 2000 sonata has a whine like its a remote control car or one of them supped up cars or a light truck but I only hear it when im going slow maybe 5 mph, i never had it looked at and it doesnt do it when im at high speeds that im aware of. Mine sounds like it comes from the front, i was thinking it was my driveshaft. Noises do funny things, maybe the sound is bouncing off different items and that could explain why it sounds like its from the dash when its really not.

Steve
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Old 01-09-2006, 09:50 AM   #4 (permalink)
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I thought that it was a wind-related noise too before I was standing outside the care one day with the engine running and could hear the same pitch whine from back near the gas tank. That (and the fact that if you lay off the gas pedal the whine will stop, even if still going 70 mph) made me turn away from wind noise and wonder if it was a fuel pump motor whine.

Wonder if it could be an air leak in the intake?
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Old 01-10-2006, 07:10 AM   #5 (permalink)
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One of the things about these cars is how quiet they are. If anything unusual is going on, the usual road / wind noise is not going to mask it. The only thing I have noticed is the sound these Michelin MXV's create on different type road surfaces. They are a good tire, but they do generate a whine on different surfaces.

If you are experiencing an intake leak, you should feel a loss of response in the throttle at the same time.

Any chance of noise from a sunroof or the air dam in front of the sunroof opening? (didn't catch whether your car came with one or not).

Does it matter if you have the air conditioner on or off? (another potential for mechanical noise or vacuum leaks)

Any chance someone else could drive the car while you "crawl around" inside the car and try to localize it? It might be helpful to let the back seats down and see if the sound increases. I suspect the noise should get louder if it is actually coming from the fuel pump.

Thanks for sharing. These types of problems are bound to crop up on a new design, and by making the community aware, everyone benefits. Close the loop for us and let us know what the source of the problem is when you do find it.
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Old 01-10-2006, 07:19 AM   #6 (permalink)
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After rereading your post, it occurs to me the problem may be vibration / heat shield related. You said that you could hear the same sound at higher rpms before the transmission shifted. You might be able to recreate the problem sitting still just by bringing the rpms up to the same range you typically have when traveling 70 mph. If you are hearing a heat shield on the engine begin to oscillate at certain rpms, you will hear it sitting still, particularly if you can do this inside your garage ( with the door open, of course ).

If it is a heat shield on the tranny, that may only be able to be recreated at speed. My .02
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Old 01-11-2006, 01:41 PM   #7 (permalink)
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My 2006 Sonata LX has the same high-pitched sound that you describe. I don't think this is wind noise. I do think it's very annoying. The car is only 3 months old, but I'm going to take it in tomorrow to have the following things diagnosed and fixed.

1. Windshield washer did not work yesterday when I tired it. Fluid is full, but no fluid is being pumped from either nozzle. Very dangerous situation encountered yesterday, when windshield got dirty from road spray (rain mist).

2. High pitched noise at higher speeds, similar to noise described on this forum. Had this problem since I purchased car. I'm affraid this is a symptom of a more serious problem waiting to materialize.

3. Low pitched rattling noise on braking at very low speeds, similar to noise describe on this forum. Have some ideas on this problem based on reading some of the forum posts.

Items 2 & 3 will likely be harder to diagnose and fix, but I'm holding Hyundai's feet to the fire until they get them fixed.

I'll let the forum know the findings and results. Any suggestions would be welcome.
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Old 01-11-2006, 05:55 PM   #8 (permalink)
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Nice to know that I'm not crazy. My family might have a different opinion, though.

drf.......please post when you get back from the dealer and let me know what you find out. If I could get that fixed the car would be more than fine to me.

The more I listen to it, the more I'm beginning to wonder if the whine might be transaxle related. If I had to bet on it, though, I'd say fuel pump. Maybe I should put on true dual exhausts and a couple of Flowmasters to drown out the whine. Wonder what that would do to the torque curve......heh heh.
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Old 01-18-2006, 02:43 PM   #9 (permalink)
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I also have noticed that high pitched whine. It is definitely RPM related and originates under the hood. If you have a passenger or the radio is on, you can't hear it over the conversation, but if all is quiet, you hear it. Wonder if it is an alternator whine?
John Feel free to respond to oj_101@hotmail.com also.
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Old 01-29-2006, 08:01 PM   #10 (permalink)
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Has anyone gotten a resolution to this problem?? My 2006 Sonata has just recently begun making this noise btw 60-65 MPH. I have sat in the driveway and revved the engine to the RPM's that would be turning when I was going 60-65 MPH and the noise does not appear. As soon as I hit 70 MPH the noise goes away.

Has anyone consulted with thier dealer about this and gotten an answer or has anyone spoken with Hyundai Global about this matter???
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