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post #11 of 18 (permalink) Old 12-13-2010, 10:22 AM Thread Starter
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Default Re: Humming

I've been driving this car since the Summer of 2000 with 217k on the clock. Until the past year I never put more than 34 lb in the tires. And the tires I bought before then were not ever rated for the proper load range, the local shop fitted the proper size and didn't acknowledge the Prius tire specs. I've averaged 47-50 all these years. I am aware of the changes in mileage according to the seasons. The mileage drop pretty much happened soon after the hybrid battery change a year ago. Unfortunately, I got new tires a week after the battery so I can't pin point exactly when it happened. The didn't start until a month ago.

If the sound was coming from the tires it would be a much higher pitch OR I would feel it.

Maybe I'll get enough of a bonus or Christmas money to have it checked out after the holidays.

Goin' for 500K!
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post #12 of 18 (permalink) Old 02-12-2011, 11:06 PM
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Default Re: Humming

Did you ever figure out what the noise was?

I have a 2002 Prius with 170,000+ miles. The batteries were replaced last summer.

For the past couple months I have had a humming coming from the rear of the car. It seems to be getting progressively louder. Before the batteries were replaced I had one of the rear wheel bearings replaced. The hum sounds very similar to the hum when the wheel bearing was going out. However, when I recently took it in to the dealer they said my wheel bearings were fine and told me it was probably the tires. I have since had the tires replaced and the hum continues.
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post #13 of 18 (permalink) Old 02-14-2011, 10:58 AM Thread Starter
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No, I haven't found the noise yet. I'm thinking it's the bearings or CV's but wouldn't it make a different sound when turning. Especially the CV's I thought would make a clanking noise while turning.

I was told that it was probably the tire at the dealer service. They said they rotated and the sound went away. They were wrong. They never drove it before hand and never knew what to listen for. The sound is most prominent at 45-55 mph.

If your like me and have driven this quiet car for 10 years you're acutely aware of any new sound it makes. My mileage has dropped from 49 to 43 in the past year.

Goin' for 500K!
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post #14 of 18 (permalink) Old 02-15-2011, 05:54 PM
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Default Re: Humming

It's not CVs if the sound is coming from the rear. No CVs back there.
Probably a rear wheel bearing. No harm in waiting for it to get a little worse so you can be sure.

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post #15 of 18 (permalink) Old 04-11-2011, 01:32 PM Thread Starter
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I'm seeing some talk of $400 per side for rear wheel bearing replacement!! Looks like the bearing are not "user replaceable" and the hub/bearing comes as a big expensive unit.

Has anyone here ever replaced them at home?

Goin' for 500K!
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post #16 of 18 (permalink) Old 03-14-2016, 08:27 AM
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So I have been looking around to figure out the humming and found this thread. I have the humming as described and varies with speed. Was the rear bearing replacement the resolution?

2010 Prius 129k
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post #17 of 18 (permalink) Old 07-22-2017, 06:51 AM
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Try this, http://www.hotrod.com/articles/how-t...oisy-rear-end/
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post #18 of 18 (permalink) Old 01-07-2018, 08:58 PM
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Quote:
Originally Posted by Alex Brown View Post
Try this, http://www.hotrod.com/articles/how-t...oisy-rear-end/
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Thank you for the link Alex. Didn't solve my problem but lead me in the right direction.
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