Another low rpm rear vibration rattle
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Another low rpm rear vibration rattle
2016 Panamera S e-hybrid
14,000 miles
consistent vibration which seems to come from rear right of car (though that’s from the drivers position only, could be all of rear).
Always between 1700-1900 rpms; this is moving up or down gears; only notice at slow speeds and gear shifts 1-4 or so; as rpms build to a shift point there is a very noticeable vibration that stops after shift; same in dropping down through gears when crossing that same rpm range
i know there have been a lot of discussions around rattles but any thoughts appreciated. Have had it into dealer once but didn’t isolate the issue - my fault for not specifying exact symptoms.
14,000 miles
consistent vibration which seems to come from rear right of car (though that’s from the drivers position only, could be all of rear).
Always between 1700-1900 rpms; this is moving up or down gears; only notice at slow speeds and gear shifts 1-4 or so; as rpms build to a shift point there is a very noticeable vibration that stops after shift; same in dropping down through gears when crossing that same rpm range
i know there have been a lot of discussions around rattles but any thoughts appreciated. Have had it into dealer once but didn’t isolate the issue - my fault for not specifying exact symptoms.
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Joined: Jul 2019
Posts: 32
From: San Diego
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I have something similar, it's like a low frequency rumble (drone), seems to be coming from the front passenger door speaker. Like the speaker grille is vibrating. Like you said, low 1700-1900 RPMs, in 2nd or 3rd gear. I got used to it, I would probably be worried if it would go away 
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Joined: Jul 2019
Posts: 115
From: Salem, OR
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First, has it always done this? That would point to a manufacturing defect. If the noise arose recently, was there some event that preceded the noise, like some shop work on the car?
I would check the exhaust system hangers. Then sort of "pound" on the mufflers to see if there is an internal rattle like a loose baffle. Also gently pound (with the heel of your fist) on each rear panel to seek a loose panel, etc. This includes light pounding with fist on rear fender, bumper, etc.
Another common source of vibration is in an unbalanced driveshaft. Driveshafts are balanced at the factory often using small weights much like wheel/tire weights. These weights are often glued, and can come off. Examine driveshaft - is there a "patch" where a weight could have been?
Try to determine which side is the source. Have someone ride in the rear seat with both windows down - move from side to side . Sometimes the sound is much louder on the outside of the car, and sometimes not. Whatever, finding general area of the sound source will be helpful.
I would check the exhaust system hangers. Then sort of "pound" on the mufflers to see if there is an internal rattle like a loose baffle. Also gently pound (with the heel of your fist) on each rear panel to seek a loose panel, etc. This includes light pounding with fist on rear fender, bumper, etc.
Another common source of vibration is in an unbalanced driveshaft. Driveshafts are balanced at the factory often using small weights much like wheel/tire weights. These weights are often glued, and can come off. Examine driveshaft - is there a "patch" where a weight could have been?
Try to determine which side is the source. Have someone ride in the rear seat with both windows down - move from side to side . Sometimes the sound is much louder on the outside of the car, and sometimes not. Whatever, finding general area of the sound source will be helpful.
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From: Texas
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Sorry for delayed response and appreciate all the input.
I bought the car CPO recently so no idea what history has been. I noticed the vibration immediately upon receiving the car (about 14000mi then).
I thought maybe the noise/vibration had gone away but finally started driving it a lot recently and to be sure in the 1700 - 1900 range there is a distinct vibration and it does ‘drone’ a bit as well. I hopped in the back seat to see if I could better identify where it was coming from and it seems to be right under the center console so likely a driveshaft balancing issue(?).
Mine’s a hybrid and there is no sound when under e-power. The exhaust area was checked by dealer when I originally took it in.
Now that I have it nailed down guess it’s time for another visit.
I bought the car CPO recently so no idea what history has been. I noticed the vibration immediately upon receiving the car (about 14000mi then).
I thought maybe the noise/vibration had gone away but finally started driving it a lot recently and to be sure in the 1700 - 1900 range there is a distinct vibration and it does ‘drone’ a bit as well. I hopped in the back seat to see if I could better identify where it was coming from and it seems to be right under the center console so likely a driveshaft balancing issue(?).
Mine’s a hybrid and there is no sound when under e-power. The exhaust area was checked by dealer when I originally took it in.
Now that I have it nailed down guess it’s time for another visit.
First, has it always done this? That would point to a manufacturing defect. If the noise arose recently, was there some event that preceded the noise, like some shop work on the car?
I would check the exhaust system hangers. Then sort of "pound" on the mufflers to see if there is an internal rattle like a loose baffle. Also gently pound (with the heel of your fist) on each rear panel to seek a loose panel, etc. This includes light pounding with fist on rear fender, bumper, etc.
Another common source of vibration is in an unbalanced driveshaft. Driveshafts are balanced at the factory often using small weights much like wheel/tire weights. These weights are often glued, and can come off. Examine driveshaft - is there a "patch" where a weight could have been?
Try to determine which side is the source. Have someone ride in the rear seat with both windows down - move from side to side . Sometimes the sound is much louder on the outside of the car, and sometimes not. Whatever, finding general area of the sound source will be helpful.
I would check the exhaust system hangers. Then sort of "pound" on the mufflers to see if there is an internal rattle like a loose baffle. Also gently pound (with the heel of your fist) on each rear panel to seek a loose panel, etc. This includes light pounding with fist on rear fender, bumper, etc.
Another common source of vibration is in an unbalanced driveshaft. Driveshafts are balanced at the factory often using small weights much like wheel/tire weights. These weights are often glued, and can come off. Examine driveshaft - is there a "patch" where a weight could have been?
Try to determine which side is the source. Have someone ride in the rear seat with both windows down - move from side to side . Sometimes the sound is much louder on the outside of the car, and sometimes not. Whatever, finding general area of the sound source will be helpful.
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Joined: Jul 2017
Posts: 334
From: Colorado
Rep Power: 22
I had a similar 'rumble' in my 996 C4 under similar driving conditions and it ended up being bad transmission mounts. Once replaced, it was smooth sailing...hope you get to the bottom of this annoyance.
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