isabellschwarz1
Mercedes SLC Diesel Transmission Problems
Summary of the thread
A 2019 Mercedes SLC Diesel experienced gearbox issues, likely due to a faulty transmission control unit. This problem can cause the car to enter emergency mode and exhibit unusual shifting behavior. It was advised not to drive the vehicle to prevent further damage and to have it checked by a professional. The issue was resolved by replacing the defective transmission control unit.
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4 comment(s)
isabellschwarz1 (community.author)
I don't have the error codes right now. I'll need to get them. Is it safe to keep driving the car
robertkoenig23
Since it's in emergency mode and making grinding noises, I wouldn't drive it. You could make the transmission even worse. Emergency mode is there to stop big problems, but driving it could still hurt things. Get it to a Mercedes-Benz transmission shop for a checkup and fix ASAP.
isabellschwarz1 (community.author)
Thanks I had the car taken to a shop. They said you were right, the transmission control unit was bad. They replaced it and it's fixed now.
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MERCEDES
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SLC
robertkoenig23
That sounds like typical transmission control unit failure, especially the electronic parts that control shifting and how it talks to the car's network. I've seen similar stuff on other brands. An Audi A6 I worked on had similar problems with its mechatronic unit, causing it to go into emergency mode and shift weirdly. A scan showed a bad control module that needed replacing. Can you share the exact error codes from the scan? That would help figure out what's going on.