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Old 02-22-2010, 04:48 PM   #1
venice17517
 
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Subject:Rattle Noise Under Vehicle - May Be Engine RPM Related

#PI0027: Rattle Noise Under Vehicle - May Be Engine RPM Related - (Feb 3, 2010)

Subject:Rattle Noise Under Vehicle - May Be Engine RPM Related

Models:2010 Chevrolet Camaro SS
Equipped with 6.2L V8 Engine
Please Refer to GMVIS


The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2393338&from=sm#ss1-2393338">Condition/Concern

Some customers may comment on a rattle noise from under the vehicle. This noise is mostly reported when the vehicle is cold and may go away completely when the engine is warm.
It is possible that the internal baffles may be loose in the mufflers on vehicles produced before September 15, 2009 or the resonators on vehicles built before December 1, 2009.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2393338&from=sm#ss2-2393338">Recommendations/Instructions

To diagnose loose baffles in either component, use the following method.
  1. <LI type=1>Lift and suitably support the vehicle. <LI type=1>Locate the muffler at the rear of the vehicle. <A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2393338&from=sm#oth3-2393338">Muffler Rattle Diagnosis Tap Points




    <LI type=1>Using a rubber mallet, strike the exhaust pipes in the bend just ahead of the mufflers as shown. If loose baffles are present, you should hear them rattle when tapping with the rubber mallet. Replace the exhaust system to correct this condition. Important: You must only tap on the exhaust pipe at the positions shown. Tapping further away from the mufflers may cause other reverberations that do not indicate a need to replace components.
    <LI type=1>Locate the resonator at the mid-point of the vehicle. <A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2393338&from=sm#oth4-2393338">Resonator Rattle Diagnosis Rear Tap Points




    <A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2393338&from=sm#oth5-2393338">Resonator Rattle Diagnosis Front Tap Points




    <LI type=1>Using a rubber mallet, strike the exhaust pipes both in front of the resonator and behind the resonator as shown. Important: You must only tap on the exhaust pipe at the positions shown. Tapping further away from the resonator may cause other reverberations that do not indicate a need to replace components.
  2. If loose baffles are present, you should hear them rattle when tapping with the rubber mallet. Replace the exhaust system to correct this condition.
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Old 02-23-2010, 06:52 AM   #2
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Thanks for the post!

Looks like I'll be getting this...
"Replace the exhaust system to correct this condition."
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Old 02-23-2010, 06:56 AM   #3
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Does GM or the dealership have to fix this, is this like a recall?
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Old 02-23-2010, 08:02 AM   #4
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I brought my car in the dealership the other day for a noise and I was told that the muffler I have is no longer used. They had to order the parts for it, but they said once it comes in, they'll replace it for me. I was told it shouldn't cost me anything, but once I go in to get it replaced, I'll see for sure.
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Old 02-27-2010, 07:22 AM   #5
gtc352
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Finally!

I've been looking for that rattle for months. I've torn the whole trunk down, checked every heat shield and lost alot of sleep. I'm in the dealership now (3rd time) having them check it out. Great info, I showed the service guy what to look for. Hopefuly this is the problem and I can get some sleep at night!
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Old 02-27-2010, 10:45 AM   #6
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Yep. I was the muffler baffles. They are ordering a new exhaust for me. Should be in this week. All covered by the warranty. Thanks for the post VENICE17517!
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Old 02-27-2010, 07:47 PM   #7
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I have a similar rattle but more at low speeds (almost stopped) or when reversing and it sounds like it is right under the tranny??
Could this be a heatsheild possibly?
Thanx for any advice.
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Old 02-28-2010, 09:56 AM   #8
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Had the same noise on my 2LT. Then it just disappeared, right after 2 trips to the dealer. The mechanic could replicate the noise and moved some of the heat shields slightly. I assumed that did the trick....

Now it's back again after nothing for about 3 months. Hmmmm. Wonder if it applies to the V6 too. Noise is right under the trans, very faint and slows down/speeds up with the car's movement.
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Old 02-28-2010, 11:21 AM   #9
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Is this the noise you hear when you are decelerating on gear? The noise that almost sounds like your car is running too rich?
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Old 03-02-2010, 05:41 PM   #10
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So I had my car taken in for this, they replaced my exhaust. I previously had this sort of high-pitch clicking noise that would happen when I'd let off the accelerator and continue for a few seconds. It never happened when the car was at a stand still, and was hardly noticeable at first. If the radio was on or even if the AC was on, if you weren't specifically listening for it, you probably wouldn't hear it.

Once I heard it the first time though, it was really bugging me. Now, with the newer stock exhaust, the car sounds fine!
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Old 03-02-2010, 05:53 PM   #11
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I developed one on my Saturn Sky, it would happen only at certian RPMS also and found out a piece of gravel had gotten caught between the heat shield and the body, and sometimes it would sound like the whole underneath of the car was going to fall out... Scared the crap out of me...
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Old 07-19-2010, 07:42 PM   #12
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Rattle noise under Vehicle

I seem to hear a similar Rattle/vibration when I down shift or the engine strains a little before I down shift to pickup speed. Temperature doesn't seem to be a factor. Sometimes starting off in first gear i hear the rattle/ vibration. I have a Jewl Red 2SS. Dose this seem to be the same asyou hear. I also don't like leaving my car at the dealer. I'm hoping when I go in I can get a mechanic to ride with me to hear. I don't like leaving my car at the dealer. Hopefully I can get a mechanic to ride with me to hear it. How do you guys feel about leaving your cars?
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Old 07-24-2010, 08:56 AM   #13
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My rattling sounds like metal tapping, almost if something is loose, but its a pain in the ass, and kind of embarrasing!
dealership didnt find anything, but i added Flowmaster system and resonated x-pipe, so dont think they are changing my exhaust anytime soon.
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Old 07-24-2010, 09:34 AM   #14
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Take a look under the center of the car, there is a metal cross brace there. Try taking that off and see if the rattle goes away. (in my case my exhaust was hitting/rattleing on that) Dont leave it off of course, since it needs to be there, but it is a good way to test.
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Old 07-28-2010, 06:07 PM   #15
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Silver Ice Man
Quote:
I have a similar rattle but more at low speeds (almost stopped) or when reversing and it sounds like it is right under the tranny??
Could this be a heatsheild possibly?
Thanx for any advice.
I hear this sound on my 2011 when I'm in reverse then push the clutch pedal in. It also happens in first gear. Feels like something is shaking at or in the transmission.
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Old 09-27-2010, 09:23 PM   #16
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Mine is doing the same thing.......after an oil/trans/rear differential change. I am running aftermarket exhaust with only the stock cats. Honestly it almost sounds like the headers rattle a little bit. It quits when the car warms up.
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Old 05-04-2011, 09:20 AM   #17
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Mine is rattleing to... Someone else mentioned transmission, that is how it does sound to me as well... However, once on the lift, and running obviously, can hear funny clatter coming from mufflers, both make weird noise, one is louder than the other??? They are going to replce whole exhaust, Hopefully this will fix it... someone else on the forum also mentioned when they removed stock exhaust, TONS of water pured out of the muffler.... We will see, hopefully this is the cure for my 2011 ss/
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Old 05-04-2011, 11:11 AM   #18
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Quote:
Originally Posted by DVAS View Post
Mine is rattleing to... Someone else mentioned transmission, that is how it does sound to me as well... However, once on the lift, and running obviously, can hear funny clatter coming from mufflers, both make weird noise, one is louder than the other??? They are going to replce whole exhaust, Hopefully this will fix it... someone else on the forum also mentioned when they removed stock exhaust, TONS of water pured out of the muffler.... We will see, hopefully this is the cure for my 2011 ss/
The baffles inside the exhaust cans are rusted out and rattling. Do this, take a tootpick or skinny screw driver and poke the weep hole on the underside of each can to unclog it and be prepared for a waterfall. The weep holes get clogged up by soot/carbon deposits and not let condensation escape, condensation is water and the muffler cans become a collection pool. Dealer will replace them under warranty.
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Old 05-09-2011, 06:35 PM   #19
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Quote:
Originally Posted by ffrcobra_65 View Post
The baffles inside the exhaust cans are rusted out and rattling. Do this, take a tootpick or skinny screw driver and poke the weep hole on the underside of each can to unclog it and be prepared for a waterfall. The weep holes get clogged up by soot/carbon deposits and not let condensation escape, condensation is water and the muffler cans become a collection pool. Dealer will replace them under warranty.
Thanks ffrcobra!!!

They should be calling any-day this week telling me new exhaust is in. AND new calipers... They cleaned the rotors up with good intentions of removing rust: between this and detail folks, they totally ruined the finish on the Brembos, in addition to the paint on my brake pads.... Hopefully my luck is better once exhaust is swapped out, and the only thing I will need to do is change poil for a while..... :-)arge with them when they remove old exhaust and ask them to do the trick you reference.... THANKS A TON
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Old 06-22-2011, 03:50 PM   #20
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I am having the same rattling/vibration noises from exhaust system when first starting engine, really loud when sitting in garage. taking it in tomorrow for "BCM" reprogram, will mention it to service manager, and ask about "TSB" on this matter.
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Old 07-10-2011, 02:50 AM   #21
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Rattling sound

I just bought a brand new 2011 V6 Auto with 56 miles on it, drove it home and heard a horrible rattling sound mostly coming from the left exhaust tail pipe area. I took it to the dealer on day 2 and he said it was a rock, whatever dude it was NOT a rock. The sound is horrible and I only hear it at idle. My car is brand flippin new and its already in the shop. I hope they figure out whats wrong : (
Its a ting ting sound like metal on metal....any ideas?
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Old 07-12-2011, 10:56 AM   #22
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Hollywood74, have you tried speaking with another dealership in regards to this issue? I'm sorry to hear you're having problems this early in the ownership of your vehicle. If you're unable to get this addressed by your dealer let me know and I'll do what I can to assist you.

Jeff Morris, Chevrolet Customer Service
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Old 07-12-2011, 02:32 PM   #23
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Quote:
Originally Posted by Wvallediego View Post
Is this the noise you hear when you are decelerating on gear? The noise that almost sounds like your car is running too rich?

It happens both accelerating and decelerating for me. It's kind of annoying when you have passangers and they are like...wtf is that noise. Feels like it's coming from the transmission more than the exhaust though.
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Old 09-19-2011, 04:23 PM   #24
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Took my car in for same reason as you guys. Raspy exhaust sound and fast ticking in rear end portion of the car. Happens at low speeds or low gear acceleration. Took it to the dealership and sure enough they said the stock trash cans(baffles) in the back are no good. So getting a new stock exhaust whenever it comes in. The ultimate fix would be after market exhaust,(MBRP baby) but I dont got da money doo.
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Old 09-20-2011, 08:43 AM   #25
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Same noise here. Took it to the dealership and they replaced and that fixed it. Unfortunely, they also replaced my lifters and destroyed my engine, but that's another story.
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