richardhimmel53

Mercedes SLC diesel transmission issues

My 2020 Mercedes SLC diesel is throwing some serious transmission errors at 106453 km. Getting implausible shifting, the transmission light's on, and it's basically stuck in emergency mode. I suspect undervoltage might be the culprit, but has anyone seen this before? Could worn car transmission oil be the reason? I'm thinking of doing an oil replacement.

4 comment(s)

Sounds familiar. I had similar automatic gearbox issues with my SLC. Was the slipping transmission noticeable before the light came on? Did you check the transmission oil level before considering a replacement?

The slipping was subtle, almost unnoticeable, then BAM, emergency mode. I haven't checked the oil level yet; honestly, I was more focused on the error codes. You think just low oil could cause all this?

Could be low, could be worn out. In my case, it turned out to be both, and likely tied to an electrical issue causing the undervoltage. But honestly, with those symptoms, isn't a trip to a trusted shop in order? Save yourself some potential headaches.

You were spot on. Took it to the shop, undervoltage situation confirmed, and the automatic transmission oil was indeed knackered. Oil replacement and electrical fix cost me 240€. Shifts like new now. Thanks for the nudge!

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