ECO STOP-START ISSUE

[Herman C]

Hi all. On cold start when turning on the ignition the stop-start amber ECO light fires up as expected and the light is green on the override dashboard button. The moment you start the car the amber ECO light disappears and the green light on the override button is dead and the stop-start function is not working. After restarting the engine everything works fine. Anyone else had this issue before? I recently replaced the auxiliary battery.

 

[dry run]

I wish mine did that

 

[Gazwould]

His car fixed itself .

We are lead to believe a whole bunch of stuff from car manufacturers and the gubberment but they are getting caught out all the time .

 

[John Laidlaw]

Welcome , it's likely too cold for all that stuff to be working

 

[Steve@Avantgarde]

Read the manual.....

The stop start will likely disable within the 15mins of driving and is temperature dependent also depending on what consumers are switched on as well.

Or your battery is starting to loose its hold and crank capacity.

 

[Jasons76]

mine did that before christmas i replaced the main battery between christmas and new year and its been fine ever since.

 

[richlumb]

Certain conditions need to be met for the stop start to work , temperature is one of them conditions. They all the same mine doesn’t work the same at min either

 

[Herman C]

Good day all. Thank you for all your feedback. Maybe I did not make myself clear enough. When turning on the ignition first time in morning whilst engine is cold, all appears to be normal (amber ECO light is on (dashboard) and green light is on (on-off switch). Then when starting the car first time in the morning (cold start), the amber ECO light disappears and the green light on on-off switch is “dead” and when you press the switch nothing happens. The only way to get the stop-start system back is by switching off the engine and restarting the car. During the day all works just fine. It has something to do with first start / cold start. Thank you

 

[anyweb]

you need to check your battery, if it's not charged to a certain level then the start/stop functionality will be disabled (will not even try). In cold weather this is common as the battery has to work extra hard to start the car, so to resolve, go for a one or two hour drive to fully charge your battery and the next day you should notice a difference, if not, then perhaps it's time to consider changing the battery.

 

[A.J.]

you need to check your battery, if it's not charged to a certain level then the start/stop functionality will be disabled (will not even try). In cold weather this is common, so to resolve, go for a one or two hour drive to fully charge your battery and the next day you should notice a difference, if not, then it's time to consider changing the battery.

Non essential journey, contrary to our Covid Lock Down instructions. However every other week I do just that, maybe not two hours but certainly close to one hour

 

[anyweb]

ah i didn't think of that, I live in Sweden so we can drive whenever we want for as long as we want.

 

[Jasons76]

Good day all. Thank you for all your feedback. Maybe I did not make myself clear enough. When turning on the ignition first time in morning whilst engine is cold, all appears to be normal (amber ECO light is on (dashboard) and green light is on (on-off switch). Then when starting the car first time in the morning (cold start), the amber ECO light disappears and the green light on on-off switch is “dead” and when you press the switch nothing happens. The only way to get the stop-start system back is by switching off the engine and restarting the car. During the day all works just fine. It has something to do with first start / cold start. Thank you

it will be the main battery mine did the exactly the same thing as you are describing

 

[Herman C]

Good day all. Thank you for all the valuable feedback. I will replace the main battery and let you know in due course.

 

[Tony Dyson]

You'll be wasting your money if the battery doesn't need changing, have you tested it or had it tested?
Your target is 12.6v without the engine running and around 14.6 with the engine running.
Have these symptoms recently developed or have you just decided to do something about them?
How long have you had the car and were these symptoms present from the beginning?

 

[A.J.]

As Tony says, before you go and buy a battery get it drop tested first, could save you a few quid

 

[John Laidlaw]

Although, assuming the battery is the original 2014 one, it's 7 years old, my 212 needed a change at 4 years, seemed a bit premature but nowadays 5 years is about it...

 

[ajlsl600]

Yup in 2001 my new clk batt lasted ten yr. A class now shot in 6 sure ml will be in 5 . Two things ,more electronic crxx to run and maker prob lowering stds to reach a more acceptable ( to them,) dtf point.
In a nutshell .nothing modern lasts ! Just as one gets used to it one is looking to replace it.or in my case plannin to manage without it. Want something to last,buy something old !

 

[John Laidlaw]

Yup in 2001 my new clk batt lasted ten yr. A class now shot in 6 sure ml will be in 5 . Two things ,more electronic crxx to run and maker prob lowering stds to reach a more acceptable ( to them,) dtf point.
In a nutshell .nothing modern lasts ! Just as one gets used to it one is looking to replace it.or in my case plannin to manage without it. Want something to last,buy something old !

I lit the touchpaper again there.....

 

[malcolm E53 AMG]

Although, assuming the battery is the original 2014 one, it's 7 years old, my 212 needed a change at 4 years, seemed a bit premature but nowadays 5 years is about it...

Yes, another consequence of Stop/Start demands - mine lasted 6 years

 

[Gazwould]

Not very Eco is it...

So ordinary lead acid of good quality and the same size good for 50,000 starts .

An AGM 360,000 starts .

Yet people are replacing AGM not because it's gone or slow starting the car but because this wrecking ball abomination of a so called Eco feature is thankfully no longer working .



My AGM is 10 years old and sub 80K and it's days are numbered as only charges to 12 / 12.1V but starts the car no problem .


The last 110 lead acid battery I replaced was 12.5 years old and the car had done 173K !