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mike_a_mechanic, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 5471
Experience:  17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
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M Class automatic gear box works when it is cold, but as soon

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M Class automatic gear box works when it is cold, but as soon as the oil gets hot stays in 3rd gear.
Hello, welcome. My name is***** will do my very best to assist you with your question. I apologize if you have been waiting long for a response.
The vehicle is likely going in to limp mode and the most common reason for this issue is the turbine speed sensor is starting to fail which is a common problem on these vehicles.
The sensor sits behind the valve body inside of the gear box and will need to be replaced.
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