M-Class (W166) Produced 2012-2015

'13 ML 350 US low voltage codes

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Old Jun 13, 2025 | 10:58 AM
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R129Evangelist's Avatar
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2000 R129 SL500 Designo, 2013 ML350
Exclamation '13 ML 350 US low voltage codes

Hi there,
My battery failed and was replaced a few days ago. I cleared the codes and the next day these appeared.
I'm hoping there might be some clue as to the continuing error codes it is throwing.
Thanks, Thom





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Old Jun 13, 2025 | 01:08 PM
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W212 MY'14 M276-3.5NA @75kMi
STOCK VOLTAGE ROLLERCOASTER

I am sorry to read you have voltage headaches. There are ways around it.
Things aren't what they appear to be.... STORED really means "transient" fault or "semi-ACTIVE".

Your chassis features the stock "variable voltage" to save gas that sometimes turns into "unstable voltage" and in extreme casses "drained by driving" including limp modes while driving.

You will want to learn the key sequence to display your battery voltage + current while driving so you can tell us where the limits are.

I recommend not listening to radio without the engine running.

Also you'll want to charge up your battery with a CTEK float charger or better to prevent it going flat.

The engine is extremely voltage sensitive. It dislikes stock voltage swings: 12.6V to 14.9V or low voltages.

MB Low-voltage is not caused by bad battery nor bad alternator. It's caused by networking disfunction. So new batteries and alternator do nothing helpful.



Last edited by CaliBenzDriver; Jun 13, 2025 at 01:26 PM.
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