B250e turned off while in flight -- Mercedes has no clue what caused it.

Seth Rosenberg · Jan 31, 2025

I have filed a complaint with NHSTA and am currently trying to get Mercedes to respond. The dealer has had the car for one month and has no idea what's wrong. They want to charge me thousands of dollars in diagnostics but say that they really don't know what the unspecified error codes mean. -- I would pay for diagnostics if they had a concept of what they could fix and what the costs might be but they don't seem to.

2017 model 35Mph to zero—the car has less than 50K and was running perfectly until it stopped mid-flight. Glad that the stop just missed having enough force to deploy the airbags --

Has anyone had a similar experience, outcomes, etc.?

The-Red · Feb 14, 2025

This is scary considering I am about to purchase a 2017 with less than 40K on it. Have you had any other issues besides this, which is obviously very major, in the last few years?

OriginalGriff · Feb 15, 2025

Check the motor: you can remove the speed sensor pretty easily and inspect it: if it is clean and dry all is fine. If it's wet or "rusty" then the rotor coolant seal is shot - a common problem with the Tesla LDU. If it's only a bit wet, you can probably get away with just a Coolant Delete; if it's "rusty" or "crusty" then the rotor is probably scrap (and likely the whole motor assembly).
If it gets far enough, the motor will just stop. The seal failure isn't a "may happen" problem, it's a "will happen": just a matter of time. So if your sensor is dry, get the coolant delete mod done when you can to prevent it.

Google for "coolant delete" and you'll find a lot of info (and sad MB / Telsa / RAV4 drivers).

Me? I'm trading in my B250e in a week for a 2024 EQB ...

Linh Thanh · Monday at 9:33 AM

The-Red said:
This is scary considering I am about to purchase a 2017 with less than 40K on it. Have you had any other issues besides this, which is obviously very major, in the last few years?

Don’t go for it.
Read Linh Thanh’s post #2 Dec 08, 2024, under Modification and Accessories.

Seth Rosenberg · Wednesday at 1:21 PM

The-Red said:
This is scary considering I am about to purchase a 2017 with less than 40K on it. Have you had any other issues besides this, which is obviously very major, in the last few years?

It had been a wonderful car with no problems -- still waiting for a real response from Mercedes.

B250e turned off while in flight -- Mercedes has no clue what caused it.

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