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berndlion93

Mercedes B Klasse Transmission Issue

My 2020 Mercedes B Klasse diesel is acting up. It's got about 296409 km on it. The transmission indicator and check engine light are on. The automatic transmission is stuck in emergency mode and isn't shifting right, feels like it's slipping and sometimes makes a grinding noise. Error codes point to the radiator oil pressure being defective. I'm thinking it might be a dodgy cable or plug connection. Has anyone dealt with something similar? I'm also worried about car overheating and if it could be related to radiator coolant or a coolant leak. I'm trying to get a handle on this before I think about radiator repair or leak detection. The estimated repair cost is around 95€.

4 comment(s)

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?

berndlion93 (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 (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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