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Old 07-08-2014, 05:40 PM
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2 Hz noise at highway speeds, left rear

I have a 2009 Jeep Grand Cherokee 4x4 Laredo.For approximately the past 10 months there has been a noise coming from the left rear of the vehicle at speeds above approximately 60 mph and persists as long as you are above 60 mph.The sound is not metallic in nature, it sounds more like a seat belt flapping against something.The frequency is approximately 2 Hz and is very consistent at highway speeds.Driving on a very smooth surface, like brand new asphalt, reduces the volume of the sound.The driver can seldom hear it apparently due to interior acoustics, but someone in the passenger seat or the back seat hears it plainly, over a period of time it is very annoying.In addition, if you touch the left rear interior side panel (in the cargo area) you can feel a small vibration that matches the sound.I have had the vehicle inspected by Jeep, they find nothing.I have had the left rear interior panel removed to see if there was a problem with the sound system cable bundle that runs through there, but it was OK.The tires have been rotated, no change. We thought it might be the metal gas tank door vibrating in the wind stream, so we taped the door down, but the sound was not affected.By process of elimination it seems like the sound might be coming from the fuel supply line, which has a lot of play in it at the fuel cap end (seems like this play might be normal for a Jeep).Does anyone have any insight if that could be the source of the sound?And if so, what exactly needs to be done to suppress the sound?
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Old 07-08-2014, 07:57 PM
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This is a long shot and wouldn't really explain why it would be more quiet on smooth road, but look around for loose stickers under there, like on the drive shaft, or any of those wires or cables.

Chrysler has had some loose fuel filler neck issues in the past, so if you haven't asked your dealer about that specifically, it might not hurt.
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