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Auxiliary Battery malfunction

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Old Aug 8, 2018 | 01:53 AM
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E350
Auxiliary Battery malfunction
What does this mean? Is this sometime Mercedes will fix under the manufacter warranty under 50,000 miles?
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Old Aug 8, 2018 | 11:05 AM
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2014 Mercedes e350
i had that and under warranty they replaced the aux battery that was in the trunk. It means your start / stop will not work, and the parking brake i think .
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Old Aug 8, 2018 | 01:04 PM
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2007 cls550
I have one at the house to replace this weekend although it is under dash left of steering wheel on a 2011 E350.
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Old Aug 8, 2018 | 01:05 PM
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2007 cls550
Also allows car to shift to natural if main battery dies.
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Old Aug 8, 2018 | 05:35 PM
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2011 E550 P2 4M Sedan
OP, what year car do you have? I think prior to 2013 (or whever they added ECO stop/start) it was just a small battery in dash for brake hold feature and powering electronic shifter if car won't start. When they added ECO stop/start they moved it to the trunk and it powers car when engines nods off.

Should be covered under factory warranty if still active.
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Old Aug 9, 2018 | 08:52 PM
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E350
Auxiliary battery malfunction
I have a 2016 E-350, so it is likely this battery is in the trunk. It is still under manufacture warranty.
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Old Aug 10, 2018 | 04:15 PM
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Yup, it's the one in the trunk. Good thing you're still under warranty as that aux battery is pricey.
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Old Aug 10, 2018 | 04:39 PM
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2014 E350 W212
Originally Posted by Marekbab
i had that and under warranty they replaced the aux battery that was in the trunk. It means your start / stop will not work, and the parking brake i think .
op's post already answered but exactly the same here... replaced under warranty...
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Old Aug 10, 2018 | 04:40 PM
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2007 cls550
Mine was off amazon genuine oem for $47 delivered
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Old Aug 11, 2018 | 10:58 PM
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2010 E 350 4matic
Last time my dash said replace auxiliary battery and this time it is saying auxiliary battery malfunction. Do you think it is just replacing it again? Last replaced in 2014. I have a 2010 E350 so I don't have eco feature just brake hold. Some are saying it is the voltage regulator. Thanks!
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Old Aug 12, 2018 | 10:36 AM
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2007 cls550
Oh that is interesting. Mine said malfunction. 11 e350.

Will see how it goes this month with the new one in.
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