felixtaylor2

Mercedes ML Key Battery Issues

My 2008 Mercedes ML with a gasoline engine is showing a 'key battery low' warning. Now the keyless entry isn't working, and there's an error stored in the system's memory. Sometimes unlocking or locking the car is difficult. Has anyone else experienced this?

4 comment(s)

A similar issue presented itself with my ML. Have you tried replacing the key battery?

Is it really that simple? Could a low voltage key battery actually cause all those problems?

Yes, a depleted key battery can manifest in those symptoms. The key's radio frequency output diminishes with low voltage. While replacement of the battery should resolve it, a diagnostic check at a workshop is recommended to confirm no other underlying issues.

Thanks for the advice. Replacing the key battery seems to have fixed the problem. It cost me 37€, and everything is working as it should again.

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