Mercedes 1.7 cdi judders at 50 mph it has a auto gear box

Cheack fluid level in auto box its normally yhat ,thats the problem

Hi Ray
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)

A failed transmission component or a loss of fluid pressure due to a leak or worn parts.

A mechanic would check for fuel pressure and trouble codes in the computer.

Normally a low gear box oil lvl when the car moves what oil there is goes around the transmition when you idle it all goes to the bottom making it judder

That would be the turbine speed sensor.............not a cheap fix at around £450 with main dealer

wheel bearing

• you need a Brake safety switch replaced.This is located behind you brake pedal.it's a common problem. The warning lights will reset after a few engine starts.

mercedes c220 cdi 2004 140k done gets stuck in gear then have to turn of ignition to get it working again. had recently had the gearbox serviced

Hi have a mercdes e220 cdi auto 2004 having gearbox problems: Taking reverse ok and Drive but only 1st and 2nd gear and not taking manual box any suggestions what might be wrong?