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

6,795

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 out of 1 people think this is helpful.
6,795

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.

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