'20 Start/Stop Functionality
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Joined: Jun 2020
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GLC
'20 Start/Stop Functionality
I recently noticed that my ECO start/stop functionality has stopped working. The light is still it green, so I know it is on, but the engine has not shutoff at any point when I come to a stop now in several weeks. Has anyone else noticed this and if so, what was the resolution? I thought I would check here before contacting my tech rep at MB.
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Joined: Feb 2016
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From: Los Angeles
GLC 300
I recently noticed that my ECO start/stop functionality has stopped working. The light is still it green, so I know it is on, but the engine has not shutoff at any point when I come to a stop now in several weeks. Has anyone else noticed this and if so, what was the resolution? I thought I would check here before contacting my tech rep at MB.
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Joined: Mar 2016
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From: Melbourne, Australia
2016 GLC 250d AMG pack, 2017 GLC Coupe 250d AMG pack , 2002 BMW 330Ci convertible, 2021 BMX X1 sD20i
Stop / Start will get worse and a warning will start to appear on mini front screen.
Aux Battery is NOT a battery - it is a voltage regulator with a capacitor. They seem to fail around 6 year mark.
Highly recommend using an overnight trickle charger to recharge car main battery. You might find the stop / start will work again. Main battery might be failing too.
Stop/start module is under front passenger floor carpet. MB price around $300 for small black box, that is simple plug and play, EBay will have a Bosch one around $100 I think.
Aux Battery is NOT a battery - it is a voltage regulator with a capacitor. They seem to fail around 6 year mark.
Highly recommend using an overnight trickle charger to recharge car main battery. You might find the stop / start will work again. Main battery might be failing too.
Stop/start module is under front passenger floor carpet. MB price around $300 for small black box, that is simple plug and play, EBay will have a Bosch one around $100 I think.
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Joined: Apr 2016
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From: NW
2018 GLC 4MATIC
Originally Posted by Tim_P
As someone who paid for an aftermarket hack to permanently leave ECO Start/Stop OFF, this sounds like a dream situation! 
Frequent engine stop/start must have impact on all components in a long run.
This is just my personal opinion.
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I was thinking about it but I thought any aftermarket modification will void MB warranty. Won't it?
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Joined: Apr 2016
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From: NW
2018 GLC 4MATIC
Originally Posted by dadalook
I was thinking about it but I thought any aftermarket modification will void MB warranty. Won't it?
Also, if problem with brake cylinder they need to prove your mods could cause this.
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MBWorld Fanatic!
Joined: Apr 2016
Posts: 1,124
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From: NW
2018 GLC 4MATIC
Originally Posted by dadalook
That I dont know. How? Heck I dont even have the tool yet. Is it the one from Ebay?
https://www.ebay.com/itm/MERCEDES-ca...-127632-2357-0
I think I saw similar tool made in US, it was a discussion on this forum. Try to search.
