FirstMercOwner

Can anyone help please?

I have just bought my first Mercedes, a 2011 W204 250 C Class Estate (Facelift model) with7 speed auto box. I have had it about 3 months and sometimes I find that the when slowing and stopping that when I pull away again that the auto box has swapped into Manual mode on its own.

I had thought for a long time that I must have been nudging the gear change, the button or the paddle shifts but I am sure now that I am not.

Has anyone else had this or know of this fault please?

It’s still under a warranty but it’s impossible to demonstrate easily an intermittent fault. Any ideas to prove the fault please?
Thanks
Chris

Knightmare69

Trying resetting the TCU first and see if that helps.

Colin G

TCU reset.




-Turn your car to the ON position but not any further as to start the engine.

-Press the gas pedal all the way down and hold for 5 seconds

-Turn your car off while your foot is still on the gas, but leave the key in

-Take your foot off the gas pedal and wait 2 minutes before turning on your car or removing the key


Then get out onto the highway and give it a good go where you don't have to stop and start in city traffic and drive for about 15 min.

FirstMercOwner

Thanks Knightmare69 i will try that.
Thanks Colin G, i wondered what i needed to do.

Colin G

Here is a more thorough and better explanation.


http://www.mercedesmedic.com/wp-cont...036353_640.jpg