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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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Hi, can you offer some help please? a b class 55plate has developed

Customer Question

Hi, can you offer some help please? a b class 55plate has developed a fault on the cvt auto, it is struggling to get 20mph and change up, any ideas please
Submitted: 4 years ago.
Category: Mercedes
Expert:  MB Paul replied 4 years ago.

MBpaul :

Hi - it sounds like the transmission has gone into limp mode - this happens when the transmission detects certain faults and prevents the box from shifting gears.

MBpaul :

In the first instance the vehicle will need to be checked on a diagnostic tool such as Mercedes STAR or similar to see exactly what codes are stored.

MBpaul :

A common problem can be with the speed sensors on the valve body - on this model the complete valve body will need to be replaced as it comes as one part from Mercedes.

MBpaul :

This will of course need to be confirmed with a diagnostic check before any repairs are carried out

MBpaul :

Best regards, Paul