w209 rough shift

Dec 14, 2016 | 09:02 AM

a.keen97

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Newbie

Joined: Dec 2016

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2007 CLK 350

w209 rough shift

I know there are a few threads that reference this issue but I haven't seen any specifics on where to proceed. I recently purchased my car, 07 clk 350, for a great deal, but with a limited service history. It has rough shifts from time to time when slowing to a near stop, etc. They are not terrible, just enough to notice a lag. I have never gone into limp mode nor experienced any other issues. 99% of the time the car shifts flawlessly. I wanted to know if you thought this was something I should have checked out or if it is just the nature of the vehicle/tran (from hat I have read, I assume the latter). I had read that maybe a tran update may fix this, but others said even after replacements and re-hauls, there is going to be a rough shift 3-2, 2-1. If an upgrade is a possibility, does anyone know the most recent available update and somehting I could reference by as the dealership seems to write off the thought of an update immediately. I'm very thankful for your knowledge and appreciate your time.

Dec 14, 2016 | 09:23 AM

BenzAMG99

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Joined: May 2016

Posts: 210

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C63s

Are you warming up the car before driving?

Dec 14, 2016 | 09:57 AM

a.keen97

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2007 CLK 350

Not necessarily, but even after being driven for a half hour or more, this rough shifts tends to happen periodically.

Dec 14, 2016 | 11:51 AM

Reanimation

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Joined: Apr 2015

Posts: 168

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270 cdi w209

If you have the money book it in for a gearbox service since you say the service history is limited, I bet the down changes improve. What mileage?

Last edited by Reanimation; Dec 14, 2016 at 01:14 PM.

Dec 14, 2016 | 10:16 PM

Rudeney

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Joined: Dec 2009

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NO LONGER ACTIVE

Your transmission needs a fluid and filer change (including torque converter drain) ever 40K miles. If this is a "clunk" when it downshifts from 2-1 as you are coming to a stop, then this can be solved with a firmware update to the TCU. Basically, they delay the 2-1 shift until you are fully stopped. It will cost about an hour of labor time at the dealer to do this. If you also need a fluid/filter change, you may get get them to do it as part of that service - usually around $450.

Dec 15, 2016 | 07:18 AM

a.keen97

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2007 CLK 350

Thanks all! Rudeney, do you have any specifics that I could reference the TCU update by? Dealer just says "it's been a while since an update for this Rena's has come out and I'm sure your car, being 10 years old has already received the latest one." They want to charge $200 just to search for an update, which I think is ridiculous. I'm going to go forward with a train service, hoping maybe if I had specifics on firmware I could lump that in, without them having to "search".

thanks a lot all

Dec 15, 2016 | 12:21 PM

xsever

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Joined: Aug 2013

Posts: 1,364

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2012 C300 4MATIC Sport

Quote:

Originally Posted by a.keen97

If someone here on the forum has a W209 with the 7-speed transmission and access to SDS, they can use the latter to read the firmware version of the TCU and post it here.

I have an SDS, but my car has the 5-speed not the 7-speed.

Good luck!