Mercedes-Benz CLK550 Problems

Rough Shifting of Automatic Transmission on Mercedes-Benz CLK550

Problem Description and Possible Solution

Vehicles equipped with a 7-speed automatic transmission may develop a rough shifting condition, most commonly going up from first to second gear and going down from third to second or second to first gear. Our technicians tell us this is due to an internal component failure. Mercedes has released updated parts; the transmission will need to be removed and disassembled to complete the necessary repairs.

(7 people reported this problem)

Mercedes-Benz CLK550 Vehicles With This Problem

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Average mileage: 93,700 (86,400–101,000)
3 model years affected: 2007, 2008, 2009
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Viewing 1-3 of 3 comments
When vehicle is put under low to moderate acceleration load, encounters an abrupt interruption in the acceleration, or an inability to shift. Will sometimes correct itself by backing off of accelerator, and gently administering low rpm acceleration load. A diagnostic check engine code was generated, reports an internal shifting error. The transmission is being replaced.
Noticed the slow almost dragging shift from 1st to 2nd when starting out from house and going up a hilly road to get onto the freeway. Began about 6months ago - I am at 87,000miles.
The usual P0717 error code stored in the transmission ECU. While driving or exiting the freeway the car would stay in 6th gear. I will have to find a reputable transmission shop and review my warranty to see if there is any recourse with Mercedes directly. The only fix for this for any dependable period of time is to get the transmission Valve Body TCU / EHS / 7G tronic Speed sensor plate replaced or rebuilt. To do this the car will be out of commission for a while.