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R Klasse key issues low voltage warning

My 2015 Mercedes R Klasse gasoline shows key battery low and keyless entry is dead. An error is stored and lock/unlock is finicky. Am I right in assuming it's a simple key battery replacement?

The 2015 Mercedes R Klasse displayed a low key battery warning, causing keyless entry issues and erratic lock/unlock behavior. The problem was likely due to a depleted key battery. Replacing the battery with a new CR2025 resolved the issue, confirming the initial assumption that a simple battery replacement was needed.

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4 comment(s)

I had a similar issue with my Mercedes C Klasse. Same symptoms: keyless go stopped working, and I got the low battery warning. Have you checked the battery voltage with a multimeter? Sometimes, even new batteries can have low voltage. What kind of battery is it? Is it a CR2025 or CR2032?

I haven't checked the voltage directly, but assumed it's the battery given the symptoms and message. I thought it was a common issue. What was your solution?

Yeah, it's likely just the battery. I tried a new battery myself, but still had issues. Turns out the replacement I used was also low voltage. I then went to a shop, and they did the battery replacement. I haven't had issues since.

I appreciate the feedback. A battery replacement, CR2025, at the workshop sorted it. 37€ total. Thanks.

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MERCEDES

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RKLASSE