marctiger98

B Klasse Electric key fob issue

I'm having trouble with my 2014 Mercedes B Klasse Electric. It has about 23390 km. I keep getting a 'key battery low' warning, and now keyless access isn't working. There's also an error stored. Plus, unlocking and locking the car is getting unreliable. I'm thinking it's just the key fob battery. Has anyone else had this happen?

4 comment(s)

Yep, had the exact same problem with my B Klasse! Drove me nuts. Replaced the fob battery and it fixed everything immediately. Was getting constant low voltage warnings. Check your battery type, it's usually a CR2025 or something similar. Quick and easy fix.

Thanks for the quick reply. Were your symptoms exactly the same, especially the intermittent locking and unlocking? Did you also have an error stored? Did you replace the fob battery yourself?

Yes, all symptoms were identical. Intermittent locking, unlocking, the whole shebang. I didn't check for error codes myself, but I assume it would have thrown some. I'd suggest getting a professional to do the battery replacement. They can make sure everything is properly reset afterwards.

I appreciate your thoughts. I took your advice and had the fob battery changed. The error is gone, and keyless entry works again. It cost 37€.

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