chrisadams

I have a 2003 ml 2.7 diesel automatic which is stuck in 2nd gear.Will start ok and drive but no gear change .Also once in drive cannot put into reverse without first turning engine off.Does anyone have any idea what the problem may be and any possible solutions?
The ESP ETS and BAS are also now on

The fault code is P1856 and says something like selection lever detection has failed .Anyone know solution?

I am awaiting the guy who did diagnostic to come back as he did not seem to know what needed doing

DrX

From now on, please post replies in your first thread, rather than starting a new one every time. In this way, a coherent story will develop that is easier for future helpers and people with a similar problem to comprehend.

chrisadams

My mechanic feels that the problem is the car needs a new ""gear shift control unit" and is quoting nearly £ 1200 to replace.He is not a merc specialist though.Is it possible there is just a bad connection that could be rectified or some other solution!
When I have been to this guy before whatever fault code comes up he seems to recommend a new part without looking for any other way of rectifying
If anyone can give any advice would be much appreciated
I do now understand car is in limp mode

Maj. Dundee

You must check to see if there is trans. fluid present when you separate the connector. If there is this is probably your problem.

Every thing you need is all in the below links. You do not need a new shifter..


https://mbworld.org/forums/5728551-post2.html

https://mbworld.org/forums/5283484-post2.html

https://mbworld.org/forums/5270306-post2.html

chrisadams

Dont suppose you have info on where this 13 pin connector is located as have no idea
As you can see dont know much about engines!!!

Maj. Dundee

It is on the right side of the transmission just above the trans. oil pan.

chrisadams

Have had another scan done fault code iss EGS52[GEARBOX] AT
Guy said he can do nothing needs gearbox control unit and only dealer can do
After scan engine will now not even turnover ,seems to have been elec interruption as radio needs resetting
Any help?