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.

Problem Data
RepairPal Verified
Average mileage: 86,400 (86,400–86,400)
3 model years affected: 2007, 2008, 2009
5 people reported this problem
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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.