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

7,425

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 of 1 people found this helpful.
7,425

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
    370
  • #2
    Michael Kane
    Reputation
    260
  • #3
    bobkat
    Reputation
    250
View All

Related Models For Sale

Used Mercedes-Benz SL-Class
58 Great Deals out of 3,479 listings starting at $4,930
Used BMW Z4
33 Great Deals out of 985 listings starting at $3,995
Used Mercedes-Benz C-Class
846 Great Deals out of 26,031 listings starting at $1,500
Used Mercedes-Benz E-Class
563 Great Deals out of 22,261 listings starting at $1,999
Used Mercedes-Benz CLK-Class
32 Great Deals out of 1,126 listings starting at $2,995
Used Chevrolet Corvette
180 Great Deals out of 16,275 listings starting at $3,000
Used Porsche Boxster
49 Great Deals out of 1,302 listings starting at $3,495
Used Mercedes-Benz S-Class
126 Great Deals out of 7,809 listings starting at $1,200
Used BMW 3 Series
1,061 Great Deals out of 33,098 listings starting at $1,428
Used Ford Mustang
457 Great Deals out of 42,833 listings starting at $1,488
Used Porsche 911
148 Great Deals out of 5,410 listings starting at $12,984
Used BMW 6 Series
86 Great Deals out of 2,414 listings starting at $4,995

Used Cars For Sale

2016 Mercedes-Benz SLK-Class For Sale
4 Great Deals out of 59 listings starting at $26,577
2015 Mercedes-Benz SLK-Class For Sale
15 Great Deals out of 271 listings starting at $24,950
2014 Mercedes-Benz SLK-Class For Sale
9 Great Deals out of 192 listings starting at $21,382
2013 Mercedes-Benz SLK-Class For Sale
5 Great Deals out of 83 listings starting at $15,100
2012 Mercedes-Benz SLK-Class For Sale
4 Great Deals out of 64 listings starting at $15,795

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.