ErikSpeedster
Mercedes S Klasse Transmission Issue
Summary of the thread
A 2011 Mercedes S Klasse is experiencing transmission issues, with the transmission indicator and check engine lights on, and the vehicle is in emergency mode with unusual shifts and grinding noises. The error memory suggests a radiator oil pressure defect, possibly due to a defective cable or plug connection. The problem is suspected to be a disruption in communication between the pressure sensor and the transmission control unit, potentially caused by a faulty connection. A professional inspection confirmed a defective cable, which was repaired.
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4 comment(s)
ErikSpeedster (community.author)
So, is it likely just a bad connection on the pressure sensor then? Is there a way to check?
mats_johnson90
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.
ErikSpeedster (community.author)
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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MERCEDES
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SKLASSE
mats_johnson90
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.