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lisakopas
lisakopas 1/4/2013
2008 Subaru Outback Base 4Cyl2.5L - Engine
Why does my car make a siren like noise while I'm driving?
Over the past 2 weeks my car has been making a siren like noise while I am driving. It only lasts about 5 seconds & by the time I turn down the radio to see where its coming from, the noise is gone. It seems to happen in the early morning hours (4-7am). Sometimes it happens after 2 min. of driving, but other times after 15 min. of driving. I brought it to the dealership, but they cannot duplicate the noise as it's not very predictable. Nobody seems to have heard of this issue before. Any ideas?
5 Answers
  • rick
    rick 1/4/2013
    Things like this can be very hard to find untill it happens more . I'm sure your dealer told you the same thing . Sorry but you might have to keep driving it untill it acts up enough for someone else to hear it .
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  • seansalzarulo
    seansalzarulo 2/2/2013
    This could be a few things. From experience, I can tell you that my roof rack will make a hum at highway speeds if there is an extremely strong crosswind that hits the crossbars just right. The moment I realize that the rack is making noise it seems to go away - this is probably because I slow down to see if I can hear the noise better, but this changes the wind speed across the rails, and therefore stops the noise. Also - some of these vehicles had an issue with rear wheel bearings making some noise at highway speeds after they've gone about 50,000 miles - defective bearings?. The dealer should be well aware of this as well, and there should be a Subaru Tech Bulletin about it floating around out there - the wheel bearings are covered under an extended warranty (I do not have the specifics regarding the mileage or age limitations on that warranty). If your dealer doesn't know about this, then I suggest speaking to a Subaru Regional Director or Manager, or, if feasible, see if another local dealer can assist (if there is another one in your area). Good luck… Just because the service tech can't duplicate the noise doesn't mean there is no problem. Don't take no for an answer if it's really bothering you.
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  • seansalzarulo
    seansalzarulo 2/2/2013
    This could be a few things. From experience, I can tell you that my roof rack will make a hum at highway speeds if there is an extremely strong crosswind that hits the crossbars just right. The moment I realize that the rack is making noise it seems to go away - this is probably because I slow down to see if I can hear the noise better, but this changes the wind speed across the rails, and therefore stops the noise. Also - some of these vehicles had an issue with rear wheel bearings making some noise at highway speeds after they've gone about 50,000 miles - defective bearings?. The dealer should be well aware of this as well, and there should be a Subaru Tech Bulletin about it floating around out there - the wheel bearings are covered under an extended warranty (I do not have the specifics regarding the mileage or age limitations on that warranty). If your dealer doesn't know about this, then I suggest speaking to a Subaru Regional Director or Manager, or, if feasible, see if another local dealer can assist (if there is another one in your area). Good luck… Just because the service tech can't duplicate the noise doesn't mean there is no problem. Don't take no for an answer if it's really bothering you.
    Reply
    0
  • seansalzarulo
    seansalzarulo 2/2/2013
    Sorry - posted twice in error. The TSB is # 246863 - The dealer should be able to look this # up and review the Tech Service Bulletin and remedy.
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  • HouseCallAuto
    HouseCallAuto 2/2/2013
    Its not a wheel bearing because the noise from a bad wheel bearing, although it does sound like a siren, it will not go away after a few minutes. I think you have a loose heat shield (broken / rusted through retainers or welds) that is vibrating and giving off a harmonic sound because they are like pieces of tin. When the exhaust system reaches full temperature the high frequency vibration is dampened. I would lay under the car and use the side of your fist and smack upwards in different places of the exhaust system and try to "hear" the noise. Do it when the car has not been started up yet for the day, ice cold.
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