slk320 transmission with not shift out of first gear going forward..reverse o/k

5

Asked by Jul 30, 2013 at 03:05 PM about the 2003 Mercedes-Benz SLK-Class SLK 320

Question type: Maintenance & Repair

I got a ignition switch going bad....  Am in process changing the switch out.
Before switch replacement Transmission in reverse o/k but in forward it stays in first gear... moving shifter to manual shift no effect....
w/s switch in s position..no effect if moved

2 Answers

7,695

For the most part, automatic transmissions use what is called a "Vacuum modulator" in order to shift gears, but some luxury cars use an electrical switch (E-Gear, Tiptronic) which gets its information to change transmission gears up or down, based on sensor information fed to the ECU (Engine Control Unit). The ECU takes into consideration the RPM's of the engine (based on the distributor or timing sensor rpm's), the speed of the driveshaft (based on the cruise control sensor), and numerous other sensors to determine if a shift is required at the time. Take a look and see if you have a vacuum modulator or an electrical switch to shift gears and replace that first, since it is cheaper then my next thought. If there is a burnt smell from the transmission fluid or the fluid looks brown and not red you might need a new transmission.

1 people found this helpful.
7,695

You state it does the same thing in "manual" mode, so I'm thinking you should just get the cost of a rebuilt transmission and save yourself the time and hassle of replacing the switch.

Your Answer

Mercedes-Benz SLK-Class Experts

  • #1
    Richard Keeler
    Reputation
    380
  • #2
    Michael Kane
    Reputation
    270
  • #3
    bobkat
    Reputation
    260
View All

Related Models For Sale

Used Mercedes-Benz SL-Class
65 Great Deals out of 3,150 listings starting at $3,500
Used Mercedes-Benz CLK-Class
31 Great Deals out of 1,057 listings starting at $2,600
Used Mercedes-Benz C-Class
668 Great Deals out of 25,818 listings starting at $1,488
Used Mercedes-Benz E-Class
396 Great Deals out of 19,984 listings starting at $1,850
Used BMW Z4
29 Great Deals out of 913 listings starting at $3,999
Used Chevrolet Corvette
101 Great Deals out of 15,518 listings starting at $3,900
Used Porsche Boxster
25 Great Deals out of 1,123 listings starting at $2,900
Used BMW 3 Series
833 Great Deals out of 32,432 listings starting at $995
Used Mercedes-Benz S-Class
106 Great Deals out of 7,167 listings starting at $2,000
Used Mazda MX-5 Miata
39 Great Deals out of 4,679 listings starting at $2,088
Used Ford Mustang
270 Great Deals out of 37,082 listings starting at $2,150
Used Porsche 911
69 Great Deals out of 5,013 listings starting at $11,900
Used Chevrolet Camaro
224 Great Deals out of 28,922 listings starting at $3,900

Used Cars For Sale

2016 Mercedes-Benz SLK-Class For Sale
73 listings starting at $25,500
2015 Mercedes-Benz SLK-Class For Sale
7 Great Deals out of 306 listings starting at $24,288
2014 Mercedes-Benz SLK-Class For Sale
116 listings starting at $21,481
2013 Mercedes-Benz SLK-Class For Sale
3 Great Deals out of 77 listings starting at $18,900
2012 Mercedes-Benz SLK-Class For Sale
46 listings starting at $15,895

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.