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Unread 02-28-2007, 10:00 AM   #1
gdubya
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Join Date: Feb 2007
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06 Grand Cherokee Laredo

Just curious to see if anyone else with an 06 GC Laredo hears a clunk sound when you hit around 10-15 mph? I took mine in to the dealership and they said it was the anti-lock breaks doing a self test. This sound happens every time I start the jeep and hit about 12 mph. It only does it once and then not again until I start it up the next time. They told me the 06 models do this. Is this true? Why would they make them with a sound that makes me think something is wrong with the vehicle? The service tech also told me that Jeep may do something to correct this in the near future?

Has anyone else noticed this sound?

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Unread 02-28-2007, 10:54 AM   #2
gornoman
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No noises in my '06 GC Laredo.
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Unread 02-28-2007, 10:59 AM   #3
cherokeeBrit
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No such noises from mine? never heard of any car or truck performing a brake test whilst moving??? normally it would perform a system check of sensors etc and highlight any faults via warning light.
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Unread 02-28-2007, 02:47 PM   #4
soldierguy
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Mine doesn't do it. But I do know what you're talking about because my 96 VW Jetta GLX used to do a similar thing, or at least that's what the dealer told me on that vehicle. Except it wasn't a clunk noise on the VW...more of a quick plunger-sucking sound that's hard to describe. It would do it once after starting up then not do it again until I had shut the vehicle off and restarted.

And it could be related to one of a couple other things. At around 11-12 mph if you're coasting or at VERY light throttle, the transmission will shift from 1st to 2nd gear, and if your slowing down and you cross that speed, your transmission will shift from 2nd to 1st. Since you describe the noise as a clunk, I'd say it has more to do with the transmission shifting gears than with the ABS...either the transmission or something else in the driveline moving around a bit as the transmission changes gears.

Also at around 15 mph, your power door locks will automatically lock...I think that's the default setting but it can be programmed to not do it.

Easy way to try to isolate the noise would be to shut it off, restart, then hit the gas hard so the transmission shifts later...if you still hear the noise at the same speed, then it's not transmission or driveline related. But if you were to back off the throttle again before the shift to 2nd and you heard the noise during the shift, then that points to something in the driveline shifting around a bit in response to the shift.
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Unread 02-28-2007, 03:18 PM   #5
jbones1
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i can also report no problematic sounds...yet
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Unread 03-01-2007, 09:46 PM   #6
WKJeepGuy24
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No noises in my 2006 GC Laredo.
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Unread 03-02-2007, 05:30 AM   #7
goose1
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i have this noise in my 06 WK. you're right...it happens around 12 mph and only once. i assumed it had to do with speed sensitive door locks. mine only does this upon start up and never after. so it didn't really make that big of a difference to me. plus, i had never had auto door locks that were speed sensitive so i just assume this was normal.

i have also read on here somewhere that it had to do with the driveline removing the extra slack. (i know that is not really what i read, i just can't find the thread nor remember the exact wording of how it was explained.) i think this is common in the WJ as well.
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Unread 03-02-2007, 01:09 PM   #8
JPCCDD
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06 Laredo 4.7. No noises here.
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Unread 03-02-2007, 07:17 PM   #9
gornoman
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It could be the ABS system cycling. My Honda Odyssey does it each time I start out from a fresh start. I questioned a tech and he advised me the 1/2 second hum of the ABS pumps was proof that the system was "at pressure" and enabled. The Ody does it at about 3 mph however.

I have no idea if Jeeps are similarly configured.
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