berndlion93
Mercedes B Klasse Transmission Issue
Summary of the thread
A 2020 Mercedes B Klasse diesel with 296,409 km is experiencing transmission issues, indicated by the transmission and check engine lights. The automatic transmission is stuck in emergency mode, slipping, and making grinding noises. Error codes suggest a defective radiator oil pressure, possibly due to a faulty cable or plug connection. The problem was resolved by replacing a defective cable, restoring normal transmission function.
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4 comment(s)
berndlion93 (community.author)
Thanks for the reply! Appreciate the insight. When you had the issue, did it also cause the gearbox to slip or shift uncleanly? Also, did you notice any grinding noises when shifting gears? And regarding the radiator coolant, are there any specific areas I should focus on when trying leak detection?
andreaslang3
Yes, those symptoms were also present. Given the error codes and symptoms you are experiencing, I would recommend a comprehensive diagnostic assessment at a qualified workshop to confirm the root cause. It is also possible that the error stored in the error memory is not the sole cause. It would be best to proceed with caution to minimize potential damages.
berndlion93 (community.author)
Thanks for confirming. I suspected as much. Took it to a workshop as you suggested. Turns out it was indeed a defective cable, just like the error code suggested. They replaced it, and everything seems to be running smoothly again. Appreciate the help!
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MERCEDES
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BKLASSE
andreaslang3
I understand your predicament. I own a similar Mercedes B Klasse, and I previously encountered comparable symptoms. The error stored in the error memory indicated a radiator oil pressure defect, similar to your situation. I would suggest inspecting the relevant wiring harness and connector for corrosion or damage. Has the radiator coolant level been checked recently?