ErikSpeedster

Mercedes S Klasse Transmission Issue

My 2011 Mercedes S Klasse with a gasoline engine is showing some concerning symptoms. The transmission indicator and check engine lights are on. The automatic transmission is in emergency mode, shifts are unusual and unclean, and there are grinding noises. Error memory suggests a radiator oil pressure defect. I suspect a defective cable or plug connection. What could be the issue with the cooling system?

4 comment(s)

It sounds like you are experiencing a disruption in communication between the pressure sensor and the transmission control unit. The radiator coolant is responsible for cooling the transmission oil via the oil cooler. A faulty connection could cause the pressure readings to be incorrect, triggering the emergency mode. Think of it like a loose wire on a light switch it might flicker or not work at all.

So, is it likely just a bad connection on the pressure sensor then? Is there a way to check?

While a faulty connection is plausible, it is difficult to diagnose definitively without proper equipment. The grinding noise, the slipping, and the error codes all point to a potentially larger issue within the transmission itself. It is similar to diagnosing a heart problem with only a blood pressure reading. While the pressure reading is important, it does not tell the whole story. I suggest a professional inspection.

Understood. I took it to a workshop, and you were right. It was indeed a defective cable. Repair cost was 95€. Thanks for your help.

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