Auxiliary Battery malfunction - MBWorld.org Forums

08-08-2018, 01:53 AM

#1

Frances

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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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08-08-2018, 11:05 AM

#2

Marekbab

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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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Frances (08-09-2018)

08-08-2018, 01:04 PM

#3

95viper

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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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08-08-2018, 01:05 PM

#4

95viper

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2007 cls550

Also allows car to shift to natural if main battery dies.

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Frances (08-09-2018)

08-08-2018, 05:35 PM

#5

thefisch

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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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Frances (08-09-2018), Vic1965 (08-11-2018)

08-09-2018, 08:52 PM

#6

Frances

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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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Vic1965 (08-11-2018)

08-10-2018, 04:15 PM

#7

thefisch

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2011 E550 P2 4M Sedan

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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08-10-2018, 04:39 PM

#8

PatrixUSA

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2014 E350 W212

Quote:

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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08-10-2018, 04:40 PM

#9

95viper

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2007 cls550

Mine was off amazon genuine oem for $47 delivered

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Vic1965 (08-11-2018)

08-11-2018, 10:58 PM

#10

Vic1965

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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!