S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Tranny Issues

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Old Jan 1, 2006 | 08:03 PM
  #1  
op355's Avatar
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Red face Tranny Issues

Hi
I took the delivery on late october 2005.
Did not drive it that much, but I thought I could share some dislikes about the car for someone who is planning to purchase.

In general, I love the new S. Exterior is good and interior is excellent.
The only problem that I am having is transmission.
When it downshifts, sometimes, it makes 'thung' noise and feels like trying to speed up.
It does not happen often, however, it does happen once or twice a day, specially when the engine is cold.
The car has about 400 miles now, and the dealer reprogrammed the software, however, it won't solve the problem.
I guess this is the common probelm with new 7g tranny since I seen lots of people with cls complaning same problem.

Other than the tranny, I do like the car.
Hope this info helps someone who is planning to purchase.

In addition, if someone can give me better idea what might be the reason with tranny, please let me know so I can inform not so uptodate mechanics in my dealership.
Thanks in advance
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Old Jan 1, 2006 | 08:16 PM
  #2  
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RJC
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From: 2000 ft over the FL coast in a B-17
Various
Software update?
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Old Jan 1, 2006 | 08:19 PM
  #3  
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Not sure

Originally Posted by RJC
Software update?
I am not sure if it was an update or just reprogramming.
My guess is just a reptrogramming.
I will ask my dealer and repost if you wanna know in details.
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Old Jan 1, 2006 | 08:36 PM
  #4  
PHYBENZ's Avatar
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1963 220Sb
Maybe because you don't drive the car much, the Tranny is still trying to adjust to your driving.... It is an adaptive transmission, and it still might be trying to figure out how you drive....
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Old Jan 1, 2006 | 08:39 PM
  #5  
RJC's Avatar
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From: 2000 ft over the FL coast in a B-17
Various
Originally Posted by op355
I am not sure if it was an update or just reprogramming.
My guess is just a reptrogramming.
I will ask my dealer and repost if you wanna know in details.
I thought there might have been a software update for the 7G? Either way there should not be any harsh up or downshifting.
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Old Jan 2, 2006 | 04:53 AM
  #6  
ruykava's Avatar
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From: The Earth
Mercedes all the way!
actually, the 7G tranny does do a rather rough downshifting job when its new. heck, even the 5-speeder does that when it's new. no worries, drive it more, man! just 400 miles in two months - wana lend it to me to "help" you break in the car?
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Old Jan 2, 2006 | 01:00 PM
  #7  
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From: Las Vegas, NV
2011 E350 Cabriolet..White and Almond Mocha
Originally Posted by op355
Hi
I took the delivery on late october 2005.
Did not drive it that much, but I thought I could share some dislikes about the car for someone who is planning to purchase.

In general, I love the new S. Exterior is good and interior is excellent.
The only problem that I am having is transmission.
When it downshifts, sometimes, it makes 'thung' noise and feels like trying to speed up.
It does not happen often, however, it does happen once or twice a day, specially when the engine is cold.
The car has about 400 miles now, and the dealer reprogrammed the software, however, it won't solve the problem.
I guess this is the common probelm with new 7g tranny since I seen lots of people with cls complaning same problem.

Other than the tranny, I do like the car.
Hope this info helps someone who is planning to purchase.

In addition, if someone can give me better idea what might be the reason with tranny, please let me know so I can inform not so uptodate mechanics in my dealership.
Thanks in advance
It is the valve body. See my post on "7G thunk" https://mbworld.org/forums/s-class-w220/130766-7g-thunk.html

Since the fix...it is as smooth as butter...only had 1200 miles when fixed.
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Old Jan 2, 2006 | 01:33 PM
  #8  
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From: Midwest USA
2004 S500 & 2011 Mini JCW
I will bet it clunks when it downshifts from 2nd to 1st. My W220 did that to when new. Part of the transmission learning process.
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Old Jan 6, 2006 | 03:14 AM
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Thx for Info

Oh well, I guess I will wait and see how it goes.

Except the rough tranny, I bet everyone will truly enjoy the car.
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