SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Ratcheting Noise

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Old Jun 12, 2009 | 09:20 PM
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Jim K's Avatar
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2009 SL550, 2015 C300
Ratcheting Noise

Have any of you heard a ratcheting noise coming from behind the driver's seat? It is intermittent and random and sounds like the seatbelt mechanism. Lately it's been accompanied by a very slight rattle, seemingly from the same area. It's so infrequent that having the tech drive with me is likely to yield nothing. Thanks for any input.
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Old Jun 13, 2009 | 06:24 AM
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I had a similar problem a while ago. It was getting on my nervous like for a half year. Then I went to the dealer like for 5 times and he never found out what it is... And once, they just made a calibration of my trunk boot and it disappeared.
I always had this sound from the back of my head, like the roof moving or something behind me scratching, maybe it will help you.
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Old Jun 13, 2009 | 06:33 AM
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Originally Posted by Jim K
Have any of you heard a ratcheting noise coming from behind the driver's seat?
I remember some guys hearing a noise coming from behind the driver's seat which was from the fuel pump, if I'm not mistaken.
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Old Jun 13, 2009 | 01:21 PM
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Thanks, I'll check it out.
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Old Jun 14, 2009 | 12:44 PM
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Originally Posted by Havoc
I remember some guys hearing a noise coming from behind the driver's seat which was from the fuel pump, if I'm not mistaken.
Yeah, I heard there were some problems with fuel tank. People who had warranty, had it changed for free.
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Old Jun 14, 2009 | 01:09 PM
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This may be the loose baffle in the fuel tank problem, well documented here. Pain to fix, but is covered under warranty if you still have it.
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Old Jun 14, 2009 | 02:19 PM
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Fuel tank baffles should not be an issue for an 09 as it mostly affected 03 and 04 SLs but ya never know.

Last edited by RJC; Jun 14, 2009 at 02:22 PM.
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Old Jun 16, 2009 | 07:14 PM
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I've heard the racheting sound one or twice behind the driver seat, and this occurred while the car was on level pavement. I'm certain it's associated with the seatbelt mechanism. I think I was leaning forward while pulling out the belt and hooking it up in the seat clip, then as I sat back in the seat I heard the racheting sound. I then bent forward and back a couple of times to listen for it again, but all was quiet and the seltbelt functioned normally...as far as I know. Ignorance is bliss, they say.
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Old Jun 18, 2009 | 01:14 AM
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Thanks Sgooter. I know I'm not imagining this. I'm going to try and get lucky with the M-B tech and have him ride with me; maybe it'll happen while he's in the car. The odds are not good, I know, but I'll give it a shot.
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