Shifter valve inside the gearbox, £25 for the part, could also be the control unit, eiterh way you will be looking at a big bill to fix. Find a good indie mercedes specialist in you area and speak to them, you could always retro fit the manual box instead.
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This is an unusual problem the gearbox change is controlled electronically so normally the first thing to do is get the vehicle plugged into a diagnostic machine ( this would also normally require a proper mercedes start diagnostic and not a cheap one at the local garage) But assuming it is electronic you have 2 choices the gearbox control module located in the car just below the gear change lever and the main electronic control located in the oil pan of the gearbox not so easy to access, Just a thought have you ever spilt a beverage such as coffee or soda over the gear lever area ?
as I have seen this problem before with a lack of gear selection it had shorted the module, So I guess for the cheapest first stop I would locate a second hand module from the breakers yard and try this first it should be a easy DIY anything more will require some proper mechanical skills hope this is of some help, Just a last minute thought have you checked underneath for a transmission oil leak as the oil may just be low this model suffers with the "O" ring around the electronic plug failing and causing a leak its located on the right hand side of the box just above the oil pan at the front edge.
Richard (mercedes technician)
It seems oil level is low in your gearbox, and it most likely leaking from adapter bushing ( where cable is connected to gearbox). You need to replace seals or complete bushing and correct oil level. Better if you visit your mechanic.