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.Google+
Car Problem Reports
Mercedes-Benz SLK350 Internal Component Failure May Cause Rough Shifting
Mercedes-Benz SLK350 Problem
Average Mileage: 53,918 mi (24,200 mi - 112,000 mi)
Visitor, 2007 Mercedes-Benz SLK350, 30,000 mi
rough shifting from 1st to 2nd and vice versa... dont' know what needs to be replaced and corresponding costs
Visitor, 2005 Mercedes-Benz SLK350, 48,000 mi
I have lived with this problem for 7 years(but rough only on downshifting to a stop) from 11,000 (in Jun 2007) to 48,000 miles (as of Jan 2014). While under warranty, my local dealer could only "adjust it", but could never REPAIR it. But I also (unfortunately) did not insist to contact the Regional MB rep either--(as my job keeps me extremely busy). So it gave up. To work around it--and I habitually put the transmission into Neutral when slowing to a stop to prevent the rough downshifting. Now, at 48,000 mi, in addition to a Service A,B, C, D, & E--I now am putting the SLK through an additional major overhaul, requiring a new transmission. BUT I do like this car an awful lot--so I'm putting @ $15K of maintenance into it, as this little SLK basically gives the handling and accel performance, and most of the looks of an SL, at about half the cost. The women I take out in it do love this little beast.
Visitor, 2006 Mercedes-Benz SLK350, 85,231 mi
Vechicle jerks into gear when going from park to reverse or drive. Also when accelerating from a stop it will not shift beyond first gear.
Diagnosis-Replace electonic plate with Transmission control module. It was also stated the Turbine Speed sensor is defective.
Visitor, 2005 Mercedes-Benz SLK350, 32,000 mi
Harsh downshifts 3-2 and 2-1 on wife's 2005 SLK350. Upshifts are ok but slow. Took it to dealer and they reprogramed/updated the shift points. Seemed better but still harsh downshifts approaching a stop. Plan to take it back to the dealer again.
Seem to have rough shifting from 1st to 2nd gear and sometimes on the downshift. I have not had this repaired as of yet.