100% Free

No Scanner Needed

Carly logo
Prices

siegfriedroth1

Mercedes CLA Key Battery Issue

My Mercedes CLA, build year 2023, hybrid engine, is showing a 'key battery low' warning on the instrument panel. Keyless access isn't working, an error is stored, and unlocking/locking is impaired. I think the key fob battery is dead. Any advice?

Summary of the thread

A 2023 Mercedes CLA owner experienced a 'key battery low' warning, leading to impaired keyless access and locking functions. The issue was identified as a dead key fob battery. After confirming the spare key worked, it was suggested to replace the fob battery, likely a CR2032. The owner replaced the battery, resolving the problem.

Did this summary help you solve your problem?

4 comment(s)

dirkice8

I had a similar issue with my CLA. The key fob became completely unresponsive. Have you tried using the spare car key to see if that works? If so it's probably the fob battery. I had to replace my car key battery at some point.

siegfriedroth1 (community.author)

Thanks. The spare car key works fine. Can you tell me what kind of battery the car key needs?

dirkice8

It’s likely a CR2032 battery, but check your owner's manual to be sure. If you're not comfortable doing it yourself, the dealer can replace the fob battery. Parts and labor cost me 37€, but the price may be different now.

siegfriedroth1 (community.author)

I replaced the key battery and the key is working now. Problem solved.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

MERCEDES

community_crosslink_rmh_model

CLA