GLK250 Voltage Converter Module
Thread Starter
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Joined: Apr 2026
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GLK250
GLK250 Voltage Converter Module
My 2014 GLK250 does not have the Eco Start/Stop, and no auxiliary battery.
However, I get a "Auxiliary Battery Malfunction" alert on the dash. Does anyone else
have this? Anyone know how to replace it?
Also, does anyone know of a good Benz mechanic in the northwest Chicago?
However, I get a "Auxiliary Battery Malfunction" alert on the dash. Does anyone else
have this? Anyone know how to replace it?
Also, does anyone know of a good Benz mechanic in the northwest Chicago?
Thread Starter
Newbie
Joined: Apr 2026
Posts: 3
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GLK250
Thank you VSSMAN for the video. However, my car does not have an auxiliary battery because it does not have Stop/Start option.
It seems like it has what's called a "Voltage Converter Module" which needs to be replaced.
What I need to know is where is this module and how to replace it.
It seems like it has what's called a "Voltage Converter Module" which needs to be replaced.
What I need to know is where is this module and how to replace it.
MBWorld Fanatic!
Joined: Jun 2021
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Your car has an aux battery for the electronic gear selector. It's under the instrument panel, accessible through the hole where the fuse panel is. It's much smaller than the one for the eco start stop function.
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I would have thunk that "Voltage Converter Module" was referring to the electrical outlet/module (inverter) in the trunk, on the right side, that converts 12 volts D.C. to 120 or 230 volts a.c. I think it might have been part of an option package so maybe not there on some GLKs.
Last edited by MBKLUE; Apr 29, 2026 at 12:43 AM.
