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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4317
Experience:  Mercedes Benz Qualified Diagnostic Technician
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E220 cdi stuck in emergency mode 2nd & reverse how can I f

Resolved Question:

E220 cdi stuck in emergency mode 2nd & reverse how can I fix
Submitted: 3 years ago.
Category: Mercedes
Expert:  MB Paul replied 3 years ago.

MB Paul :

Hi,



The transmission being stuck in 1 gear is an indication that it has gone into limp mode.



If the transmission is going into limp mode then it should have stored a fault code - the first thing to do is get the codes read on a diagnostic tool.



Also the oil level should be checked - there is no dipstick installed from the factory so a special tool is required (a dipstick!).



Check the transmission for oil leaks - this transmission is prone to leaking from the electrical connector on the front of the transmission . If leaking from here then the electrical spacer & seals in the transmission will need to be replaced & the electrical connector cleaned with electrical cleaner.



A common fault inside the transmission is with the electrical plate - this usually shows up as a code for the transmission speed sensors. The valve chest needs to be removed for this.



Another possibility can be undervoltage fault codes stored – this is often down to a faulty battery. The battery should be checked with an electronic battery tester if undervoltage fault codes are present in the transmission ECU.



I would also recommend a transmission oil & filter change & inspect inside the sump pan for any signs of swarf indicating internal wear or damage to the transmission .




Best regards, Paul

Customer:

I have changed the oil and filter there is no sign of any swarf on the magnet but still will not come out of emergency mode

MB Paul :

Hi, ok - but have you checked for fault codes yet? This is the first step in diagnosing limp mode

MB Paul :

Best regards, Paul

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