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Cadillac STS Forum - 2005 through 2012 Discussion, Low rpm whine from rear. Differential? in Past Cadillac Vehicle Discussion; mine started a couple of weeks ago. more like a low growl/hum. not as pronounced,the faster i go. scared to ...
  1. #16
    silverfox05's Avatar
    silverfox05 is offline Cadillac Owners Member
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    Re: Low rpm whine from rear. Differential?

    mine started a couple of weeks ago. more like a low growl/hum. not as pronounced,the faster i go. scared to take it in. just had trans rebuilt last
    year, just before warranty expired.

  2. #17
    buzz's Avatar
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    Re: Low rpm whine from rear. Differential?

    I notice at certain speeds and throttle positions, I can hear a slight whine. It is fairly high pitched, and I might think it was coming from the radio. I can hear the sound whether the radio is on or off, so I doubt it is the sound system. Anyway, it appears between 40-55 mph, and seems slightly related to throttle position; i.e., whether engine is pulling or coasting. I know if I hear the sound, and let up on the throttle, it goes away; however, it doesn't always reappear when I begin accelerating again. It is intermittent and that type of condition is the most difficult to diagnose.

    It might be nothing to worry about, and if I had been driving the car for the past 30m miles, and the noise was always there, I would just consider it a bother and nothing more. Unfortunately, as of today, I added @ 5m miles, so the noise is new. I believe I read somewhere the center diff can make this type of sound, I am just wondering if anyone else had a similar experience. The 2008 STS is a V6 with the all-wheel drive feature.

  3. #18
    buzz's Avatar
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    Re: Low rpm whine from rear. Differential?

    Related to this, I was having lunch today with a couple of old friends. One of my friends has a 2005 Ford 500 with AWD. He said he was noticing a slight whine at speeds between 40 - 60 mph! He described the problem almost exactly as I did in my previous post. He got my attention and it appears this is more common than I thought. He has 150M on his 2005 AWD Ford 500, and I have only 68M on my 2008 STS. I am wondering if this is covered by Cadillac's drive train warranty? I am going to check the owner's manual to see if I have any warranty left. I do know I am good to 120M for the timing chains; however, this is different.

  4. #19
    aliskerov is offline Cadillac Owners Fanatic
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    Re: Low rpm whine from rear. Differential?

    well, mine is high-pitched, and it does almost sound like alternator whine. I'm just going to live with it. No warranty on the car and I just did the diff service and poly bushing. I usually have the music on anyway, and since I also have an exhaust I can dilute the noise with a little throttle power I doubt a mechanic could point out such a faint problem which is hard to recreate in a shop. If anyone else is up for it, I'd love to hear the results of a visit to a mechanic. Cheers.

  5. #20
    buzz's Avatar
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    Re: Low rpm whine from rear. Differential?

    Well, I am going to discuss this with a GM service tech. I discovered last night the drivetrain warranty is 5 years or 100M miles, so given the original delivery date for my STS was November, 2007, my drivetrain warranty is good untll November 2012 or 100M miles, whichever comes first. My only concern is how GM defines a failure. Is it a noise indicating something is not right, as with the failure of my 2006 SRX timing chain; or, is it a complete failure of the drivetrain where I need to tow the vehicle in for service? I will let you know what I find after a visit to the dealer.

  6. #21
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Low rpm whine from rear. Differential?

    I hear some noise once in a while. I figure it's reasonable to expect a few noises from a car with 75,000 miles that was built seven years ago.

    If it ain't broke, good luck.

  7. #22
    buzz's Avatar
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    Re: Low rpm whine from rear. Differential?

    Quote Originally Posted by EChas3 View Post
    I hear some noise once in a while. I figure it's reasonable to expect a few noises from a car with 75,000 miles that was built seven years ago.
    I agree, Chas; however, this whine is an indication something in the drivetrain is not quite right. I purchased and received the 5 volume GM service manual just today. I purchased service manuals before, and they have saved me $$ whether I do the repair myself, or leave it to a trusted service center (dealer). I looked up the transfer case and the second symptom listed is "Transfer Case Whine or Rumble Noise". The likely Cause, "Faulty bearings" or "Worn or loose chain".

    My car is still under warranty; at least for the drivetrain, so I will be visiting a dealer sometime in the near future. I will let everyone know how it comes out.

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