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Discussion Starter #1
Anyone notice their start stop function stay in yellow most of the time?

some day I driven the car all day and the light (on the dash board) still stay on yellow ( which start stop not work)

and some day the light turn green (start stop working) after a 5 mins run..

Really dont know what condition it required for the start stop to be working.
 

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This is what I gathered from the website, not too sure if this helps though

In manual transmission vehicles, the engine is switched off automatically when coasting to a stop (once the road speed drops below 8 km/h), the driver brakes and the gear lever is in neutral. If the driver engages the clutch pedal, the engine is started again. If the vehicle is equipped with an automatic transmission, it must be brought to a complete standstill before the engine is switched off. The engine restarts as soon as the driver's foot comes off the brake pedal.

Under certain conditions, some vehicles with the ECO start/stop function are also equipped with an additional starter-alternator, which is activated instead of a starter.This starts the engine much more quietly and more smoothly than a conventional starter, which is why it is ideal for operation with ECO start/stop. Using intelligent control electronics, the starter-alternator also supplies electrical energy for the on-board electrical system.

The ECO display in the instrument cluster shows when the function is active and the vehicle has come to a standstill. A faster response when starting and improved integration compared with competitor systems make for longer phases when the engine is stopped and quieter system operation. In practice, the ECO start/stop function can help achieve fuel savings, particularly in city traffic with a high number of traffic lights or traffic jams.

The ECO start/stop function developed by Mercedes Benz reduces fuel consumption and emissions by switching off the engine when the vehicle comes to a standstill (e.g. at traffic lights).

The engine restarts as soon as the driver's foot comes off the brake pedal.The intelligent ECO start/stop function adapts itself to the current driving scenario. It is linked to the air conditioner, for example, and is suspended as soon as the vehicle’s interior temperature drops below a certain threshold. Using manoeuvring detection, the ECO start/stop function is also turned off when the driver is parking the vehicle. A switch in the cockpit can deactivate the function completely at any time.
ECO start/stop function - Mercedes-Benz Canada
 

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I think it is really dependent on the ambient temperature, and what draw is being made on the vehicle. Mine seems to work as expected but then again the temperatures in the UK are pretty flat, so inside vs outside temperatures don't fluctuate too much.
 

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Discussion Starter #4
Took it back to the dealer to check and they said the batteries are running low and have to leave it there overnight to charge it back up...

and its now working much better (as it should be).
 

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There are about 8 different and very diverse criteria that need to be fulfilled before the Stop/Start function shows as available by lighting up green. The amount of charge available from the battery is just one of them. There does not seem to be any consistency in these criteria being met hence availability can be offered within minutes yet may not appear for over half an hour the next day even though conditions appear to be the same. I really don't think the function has a major impact on real world fuel economy. I suspect it's true purpose is to inflate the official consumption figures whilst controlling emissions thus giving the copy writers in the marketing department something attractive to work with.
 
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stop start

This has happened with mine too. Garage starting to blame me for my style of driving. It has been into the garage 3 times each time they seem to blame the battery, each time they have returned to car and it still does not work. Any solutions? My GLC is still under warranty
 

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This has happened with mine too. Garage starting to blame me for my style of driving. It has been into the garage 3 times each time they seem to blame the battery, each time they have returned to car and it still does not work. Any solutions? My GLC is still under warranty
I have same problem with my 2016 GLC! Not rectified on 1st & 2nd year services despite my complaints. MB service department advised that the eco stop start not functioning was due to my vehicle only covering 5000 miles a year. I do not accept this is the root cause of the system failing to operate. Suspect battery is problem or software current threshold for the battery.
Indend to persue this matter with complacent MB only to ready to fob off its customers with feeble excuse for deficient eco stop start system.
 

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This has happened with mine too. Garage starting to blame me for my style of driving. It has been into the garage 3 times each time they seem to blame the battery, each time they have returned to car and it still does not work. Any solutions? My GLC is still under warranty
I have the same problem. Took my car the the dealer today and it seems I got the same explanation as others but does not make sense to me so I will be taking it back again. I used to drive an E220 with eco mode with no problems!!
 

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Have seen on some other forums, where folk have continual "battery' issues ..or what is diagnosed as battery failures, but on more investigation ..was tracked down to a earth or earth lead issue from the battery or to one of the control boxes.

It is possible that this is giving false reading to the sensors ...so the Start/stop does not engage.

Perhaps something to discuss with your service manager.
 

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I have this problem. Car is just a year old and the Stop Start worked perfectly until the first service When the car was serviced an update to the software was done. Since then I have not seen the amber light turn green on the instrument panel despite doing longer runs - 200 miles - several times.

I have had the car at the dealership today and they say they can't find anything wrong but it is going in again next week for them to have it for a full day to do further tests.

I am aware that there are a number of conditions that may affect the function but as the way we are using the car has not changed I cannot believe there is nothing wrong.

Any suggestions?

Thanks.

Peter S
 

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I have exactly the same problem with my 2016 GLC250 & I only clock up 6000miles a year, dealer told me too many short runs, but I also regularly have a warning coming up saying battery critical, also get e.mail from Mercedes ME saying battery in a critical state needs charging, i have purchased a battery charger & regularly have to charge the battery, which i think is ridiculous on a fairly new car
 

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I think it is really dependent on the ambient temperature

the new generation vehicles are devourers of energies v because of all the electronics it is necessary to recharge very often the battery
 

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I do less than 6000 miles a year and have never had an issue, I turn the stop/start off as soon as I have started the car so it is always charging.
 

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I recently noticed that my stop start has ceased to function which is fine by me as if it does work I always turn it off . I certainly won't be asking my dealer to fix it as I find it really annoying !


Andrew
 

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Stop Start

I too have a poor stop start function on the car, previously I had a B-series for 6 years and that work every time. Since having the GLC its worked a couple of times in 8 weeks. Asked the MB garage about it and they checked the Battery, saying its ok. I do understand some people switch it off, but if its suppose to work then it should. For it to work people are saying it needs to comply with a number of factors, surely is it not just is there enough charge to start in the battery to start the car?
 

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I don't think the reasons are simply battery state. Cars these days have sophisticated management systems which constantly monitors battery state along with electrical consumption of the vehicle and balance that against electrical charge from alternator and recovery systems. If the output is high e.g. lights, wipers, aircon, seat heating, media, sat nav etc. then the stop start will not function, if little power being used it should. Not quite as simple as that but a factor I believe.
 

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Not as simple as the battery has enough charge, the following is for the GLC:

The ECO start/stop function is operational
when:
the indicator lamp in the ECO button is lit
green
the outside temperature and the atmospheric
air pressure is within the range that is suitable
for the system
the engine is at normal operating temperature
the set temperature for the vehicle interior
has been reached
the battery is sufficiently charged
the system detects that the windshield is not
fogged up when the air-conditioning system is
switched on
the hood is closed
the driver's door is closed and the driver's
seat belt is fastened
 

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I’ve had my CLS63 for 3 years now and have noticed the stop/start being available to work less and less frequently. To me it seems related to battery health. Now that it is deepest darkest winter, it is rarely available. When the weather is slightly warmer it now takes a good run before it is operational.

My battery is probably still the original and 61/2 years old, so the fact that stop/start does not work so often does not surprise me in the slightest.
 

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That did happen to mine. The dealer found a battery problem and replaced it under warranty. It seemed to be a software problem (apparently, there's a chip in the battery now !) and it was reporting a fault to the main system that made it think the battery wasn't holding a charge.
 

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Would have thought battery issues would show up on the mercedes me app.
 
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