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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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merc cls 09 power loss on driving wont go over 30 mph any

Customer Question

merc cls 09 power loss on driving wont go over 30 mph any ideas
Submitted: 3 years ago.
Category: Mercedes
Expert:  MB Paul replied 3 years ago.

MB Paul :

Hi, my name is Paul & I will try to assist you

MB Paul :

It sounds like either the engine or the gearbox has gone into limp mode - this happens when either system detects certain faults

MB Paul :

If the transmission is still shifting through the gears then it is likely that the engine has a fault - if however the transmission is stuck in one gear & not shifting then the transmission is in limp mode

MB Paul :

in either case the first step in diagnosing the problem is to have the car checked on a diagnostic tool such as Mercedes STAR to see what fault codes are stored - this will help pinpoint the cause of the limp mode

MB Paul :

There are various different issues that can all cause the same symptoms so it is very important to find out what fault codes are stored

MB Paul :

Let me know if you need anything else.

MB Paul :

Best regards, Paul