Axulliary Battery Malfunction - MBWorld.org Forums

Apr 4, 2026 | 01:49 PM

dboey

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Joined: Sep 2017

Posts: 58

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AMG C43 Sedan

Axulliary Battery Malfunction

Encountered this msg on the dashboard on my c43, replaced the auxiliary battery and also checked the fuse, the msg pop up again. Anyone care to share how to resolve this problem, thanks

Apr 4, 2026 | 08:46 PM

CaliBenzDriver

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Joined: Apr 2019

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From: Silicon Valley

W212 MY'14 M276-3.5NA @75kMi

Quote:

Originally Posted by dboey

Encountered this msg on the dashboard on my c43, replaced the auxiliary battery and also checked the fuse, the msg pop up again. Anyone care to share how to resolve this problem, thanks

You have a new AUX but still getting issue...

what is the AUX Voltage:
with engine OFF ?
with engine running ?

Pls picture of that AUX Batt

Apr 4, 2026 | 09:02 PM

AlexMonroe75

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Joined: Feb 2026

Posts: 103

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I had a issue with my '21 S 450 where the axulliary battery would go into a failed state and cause the car to shut down after startup, but updating the software fixed the problem. Has any one els had similar issues?

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