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Hi all,

My Eco Start/Stop kind of stopped working, so I took my car to the dealer.

They asked me if I don't drive my car enough, because Eco start/stop has a dedicated battery that needs to be charged at least 80%. And this wouldn't be charged if I don't drive frequently enough. (In fact, I only drive 30mins-1 hr ish for grocery once a week. Is this a known issue?

Thanks,
rjk254
 

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Yes there is a small auxiliary battery for the ECO stop/go. There have been problems with it keeping the charge to work. The last time I had a problem the dealer replaced it and did an update on the software on my GLA250 2016. It has work properly now for 4 months. There are times it is not driven for a week but have no problem. There is a very long list of things that pass a check for the ECO to work it is more than just a battery must be charged.

My GLA set on the dealers new car lot for 6 months and not driven as it only had 2 miles on it at purchase. The ECO was working when purchased. It stopped working after 7 months, dealer replaced battery and it worked for a month and stopped again and dealer replaced the second battery and did software update and it was worked for the pass 7 months.
 

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It does seem to be a known problem. If you search on "Eco Start/Stop" in the Search box, you'll find lots of discussion on it, much of it from me. I can go several days of no operation and when that has happened in the past the Eco system has dropped out, very hard to resuscitate. If you read about the Eco system in your console digital operator manual, there are quite a few engine/auto system parameters that need to cooperate for it to activate.

As a personal history, the first time mine went out dealer service replaced the auxiliary battery. That lasted maybe a month. The second time they did a manual re-programming of the computer code. That lasted about 2-3 months. The third time...not sure what they did, as they said it worked fine on their check. It lasted a couple weeks, then went out. It was just after that time the light came on for me that not operating it frequently does degrade the system, perhaps not enough charge to the auxiliary battery. I believe, but am not certain, the regenerative braking system (one of the driver console screen gauges with Range, Consumption, and Max Charge...goes green when you are braking) is an indicator of the auxiliary battery getting charged.

That said, mine last stopped working at the end of January 2017. It was just in for the first B Service, and the Eco was again repaired, said to have done a software update, whatever that means. Three days later, it's still working. Knock on wood! However, another member was recently having his second or third bout of Eco going inop, took it in for repair, and reported essentially the same fix, a software upgrade. Perhaps there is a new fix out, so I'd encourage you not to endure it for 10 months like I did, get it checked out at a dealer. For the driving I do on an island, it seems to make a 2 MPH difference. Please keep us posted and may the Force be with you.
 

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turbolink what happen with you is the same as me, they replaced battery several times and did some updates along the way. The last time was the end of March 2017 and that ended by problems. They did a battery replacement and update of systems. ECO has been 100% for 7 months.
 

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turbolink what happen with you is the same as me, they replaced battery several times and did some updates along the way. The last time was the end of March 2017 and that ended by problems. They did a battery replacement and update of systems. ECO has been 100% for 7 months.
Yes, you were the member I was referring to. It seems we've shared a common path. I hope my outcome is as fortunate as yours! Eco is great when it works. Courage!
 

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For 45 owners reading this, i think you have to be in "C" for the aux batt to charge, which of course never happens
 

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(45) You have to be in C for the system to be enabled. It charges just fine at all times running, but button or not will only engage for me in C mode. I thought it might be the manual, but it will engage on c-manual. EDIT: Button, light, nada.. if I'm in my I* mode (S+/manual), start stop will never activate.

The car sitting for a week or more should not impact it until it's about 4 years on and the battery's inherent capacity is fading. He gave you the standard granny-spiel. I've given it hundreds of times for little old ladies wondering why their corolla eats batteries when it's driven twice a month to the grocery store. Probably also a possibility for turbolink, but my friends on the island tell me the traffic is bad enough that they take the 30+ minute drives all the time just going to work.

Basically, if your motor is running for 30 minutes at a time about once a month it should be fine. Now, I never had to account for start/stop in that, but I think it will not make a huge difference. The short hops are what kills batteries, as the alternator doesn't have enough time to fully recharge the battery before it's shut off.
 

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I am just happy that my ECO has stopped working.

I usually turn it off every time I start the car, regardless if it is going to be a 2min or a 1hr drive.

So one day, after 2 years of doing that, I decided to just leave the ECO button untouched when I go out, and lo and behold, the ECO icon doesn't change from yellow to green, no matter how long I drive the car for. And that made me smile. :)
 

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HI All.
I have it fixed on my first service, changed the battery and it worked for a few weeks, and its Caput again.I will have it looked at next service before warranty expires but it will be a while . So plenty of time .
 

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Question:



How do I know if the auto start/stop is working properly or not?



Will there be an error on my dash somewhere?


I see that the "battery charge gauge" on my dash display indicating that it is NOT CHARGING no matter if I drive it for 10 minutes or an hour. I asked the MB dealership about it since it is a CPO, they said as long as there is no error message on my dash, then it is OK.



Does anybody know for sure?


Thanks.





HI All.
I have it fixed on my first service, changed the battery and it worked for a few weeks, and its Caput again.I will have it looked at next service before warranty expires but it will be a while . So plenty of time .
 

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Great question. Ours seems to be intermittent. About the time I figure its really broken it starts to work again. If I were a mechanic I'd hate this system simply because there is no apparent way to test it.

There are a number of factors required for shut off. It would be nice if there was a screen that would give the checklist so you could determine the missing piece(s) when it doesn't shut off. Or you can ignore it. I'm opting to enjoy the car for what it is including its foibles (or personality of you prefer!!!).
 

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Great question. Ours seems to be intermittent. About the time I figure its really broken it starts to work again. If I were a mechanic I'd hate this system simply because there is no apparent way to test it.

There are a number of factors required for shut off. It would be nice if there was a screen that would give the checklist so you could determine the missing piece(s) when it doesn't shut off. Or you can ignore it. I'm opting to enjoy the car for what it is including its foibles (or personality of you prefer!!!).
Hi Wayne-we sure could make a great "It would be nice" list for this car, but I'm sure you agree-it is what it is. Sometimes it's interesting to speculate what was going through the minds of the designers. I just got an email from Tesla, asking me to submit my pre-order for a Model 3. It guess it will soon be fish or cut bait time.
 

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Lots of Teslas (S models) in the San Francisco Bay Area. No eco start stop issues with a Tesla!!! I'm still waiting for the Mission E ... I suspect high depreciation with great buy options a year or two later.

Are you looking at adding to your stable or replacing?

Every engineering project I've ever done becomes a series of compromises. You can't include everything, so what do you exclude? And when designing in teams, you lose control of elements, sometimes to junior engineers, non enthusiasts, or those who don't know better.

I find it a good thing to see discussion on eco start stop rather than head gaskets or ABS braking problems ?
 

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Had our car in for its first A service and told the dealer the Eco stop/start was not working. had not been working for about three months. From reading threads on the forum I indicated a software update might be due as well as a new battery.

When we picked it up the battery had been replaced but no specific software update was installed.

Told her to order a new battery for me and I will see them in six months. Laughter all around.
 

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There are a number of factors required for shut off. It would be nice if there was a screen that would give the checklist so you could determine the missing piece(s) when it doesn't shut off. Or you can ignore it. I'm opting to enjoy the car for what it is including its foibles (or personality of you prefer!!!).
Generally speaking here is a list.

The engine goes off when the vehicle is stationary and back on again when the brake is released – in practice the ECO start/stop system operates virtually unnoticed by the driver. This is all thanks to complex control functions which run in the background to ensure efficiency, comfort and safety.

How the ECO start/stop system works in detail: as a general principle, the engine is switched off every time the vehicle comes to a standstill (auto-stop function. Restarting the engine (auto-starting function) takes place almost imperceptibly; and moving off without any noticeable time lag compared to a stationary vehicle with its engine running. This rapid action is attributable to two special features: a crankshaft Hall sensor which is able to identify the rotational direction of the crankshaft enables the engine control unit to identify the cylinder in which the piston is ideally positioned for starting. The fuel is injected into this cylinder first, thereby speeding up the starting process. An additional electric transmission oil pump supplies the clutches of the automatic transmission with oil pressure prior to starting, so as to enable a swift resumption of the journey after direct starting of the combustion engine via the ECO start/stop function. The starter motor (starter) has also undergone thorough modification: it is now designed to cope with eight times as many starting procedures, ensuring that it will last a car's lifetime in continuous urban driving involving frequent auto-starting. In addition, the on-board electrical system is supported by a second battery.
Preconditions for the ECO start/stop function
It is not always expedient for the engine to be shut down automatically when the vehicle comes to a standstill. The auto-stop function will therefore only be initiated if a number of conditions are met:

1. The combustion engine must have attained the necessary operating
parameters (e.g. the minimum coolant temperature).

2. The relevant conditions relating to the vehicle must be met (e.g. sufficient voltage in the on-board electrical system, the interior climate has been regulated following the key start, the accumulator for the air suspension or brake system is sufficiently full). And the vehicle must be stationary, of course.

3. The relevant conditions relating to the driver must be met: the transmission selector lever must be set to D or N; no movement of the accelerator or the steering wheel; the driver's foot must be on the brake or the HOLD function must be active; the doors must be closed, the driver's seat belt must be fastened and the bonnet must be closed.

4. The ECO start/stop must not have been switched off via the ECO button.

5. Relevant speeds must have been exceeded after starting with the ignition key or during manoeuvring, for example.

Auto-starting takes place when the engine is in auto-stop mode, i.e. when the engine has been shut down via the engine-stop function and the ignition remains switched on. One of the following conditions must also be met:

The accelerator pedal is pressed.

The brake pedal is released and Hold is not activated and the parking brake is released and the transmission selector lever is not set to "P".

The ECO start/stop function is switched off via the ECO switch.

The vehicle begins to roll.

A function linked to running of the engine, e.g. raising of the ride height, is activated by the driver.

But the start/stop function can think beyond that: it is also able to start the engine automatically as an intelligent comfort and safety function.
The engine control unit starts the engine automatically, without any intervention on the part of the driver, when one of the following conditions is met:

A vehicle-related precondition for the auto-stop function, such as the conditions pertaining to air conditioning, the on-board electrical system, the brake system, the chassis and other vehicle-related influences, is no longer met.

The driver releases his seat belt or opens the driver's door. Automatic starting takes place in order to prompt the driver to actively switch off the engine by turning the ignition key to position 0, prior to leaving the vehicle. This ensures that the ECO start/stop system is safely deactivated when the vehicle is parked.

To provide the driver of the CLS with the necessary assurance that the ECO start/stop function is working at all times, the availability of the auto-stop function is indicated by the ECO symbol on the multifunction display of the
instrument cluster:

Green = all conditions are met, engine will be shut down when the vehicle stops.

Yellow = ECO is active, but conditions are not met.

No ECO symbol displayed = ECO is switched off or has been deactivated due to an error.
 

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Great information. Please see the text below in "quotation" marks. The other text is cut and paste from your post.

Generally speaking here is a list.

1. The combustion engine must have attained the necessary operating
parameters (e.g. the minimum coolant temperature).

"I've had ours work 100 yards down the street at the stop sign, from a cold start."

2. The relevant conditions relating to the vehicle must be met (e.g. sufficient voltage in the on-board electrical system, the interior climate has been regulated following the key start, the accumulator for the air suspension or brake system is sufficiently full). And the vehicle must be stationary, of course.

"In the case above it was a chilly day. The heater had not warmed the car."

3. The relevant conditions relating to the driver must be met: the transmission selector lever must be set to D or N; no movement of the accelerator or the steering wheel; the driver's foot must be on the brake or the HOLD function must be active; the doors must be closed, the driver's seat belt must be fastened and the bonnet must be closed.

"Yep."

4. The ECO start/stop must not have been switched off via the ECO button.

"Yep."

5. Relevant speeds must have been exceeded after starting with the ignition key or during manoeuvring, for example.

Auto-starting takes place when the engine is in auto-stop mode, i.e. when the engine has been shut down via the engine-stop function and the ignition remains switched on. One of the following conditions must also be met:

The accelerator pedal is pressed.

"We've had shut down occur at an intersection, release of the brake for a fraction of a second without accelerator starts the motor, pressing the brake creates a second shut off."

The brake pedal is released and Hold is not activated and the parking brake is released and the transmission selector lever is not set to "P".

The ECO start/stop function is switched off via the ECO switch.

The vehicle begins to roll.

A function linked to running of the engine, e.g. raising of the ride height, is activated by the driver.

But the start/stop function can think beyond that: it is also able to start the engine automatically as an intelligent comfort and safety function.
The engine control unit starts the engine automatically, without any intervention on the part of the driver, when one of the following conditions is met:

A vehicle-related precondition for the auto-stop function, such as the conditions pertaining to air conditioning, the on-board electrical system, the brake system, the chassis and other vehicle-related influences, is no longer met.

The driver releases his seat belt or opens the driver's door. Automatic starting takes place in order to prompt the driver to actively switch off the engine by turning the ignition key to position 0, prior to leaving the vehicle. This ensures that the ECO start/stop system is safely deactivated when the vehicle is parked.

To provide the driver of the CLS with the necessary assurance that the ECO start/stop function is working at all times, the availability of the auto-stop function is indicated by the ECO symbol on the multifunction display of the
instrument cluster:

Green = all conditions are met, engine will be shut down when the vehicle stops.

Yellow = ECO is active, but conditions are not met.

No ECO symbol displayed = ECO is switched off or has been deactivated due to an error.

"I've never seen this display. There are differences between the 250 and 45."

"Beyond realizing that the car doesn't follow documented operation, my point was, given the reported problems and the absence of permanent fixes, it would be nice to be able to pull up a display with the checklist of requirements, as stated in the Owner's Manual, so the driver could determine the missing need or needs to allow a shut down. Perhaps that would allow the dealer to track down the problem. But since this isn't a CEL I'm sure such a screen is absent."
 

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Lots of Teslas (S models) in the San Francisco Bay Area. No eco start stop issues with a Tesla!!! I'm still waiting for the Mission E ... I suspect high depreciation with great buy options a year or two later.

Are you looking at adding to your stable or replacing?

Every engineering project I've ever done becomes a series of compromises. You can't include everything, so what do you exclude? And when designing in teams, you lose control of elements, sometimes to junior engineers, non enthusiasts, or those who don't know better.

I find it a good thing to see discussion on eco start stop rather than head gaskets or ABS braking problems ?
I would be replacing the GLA. I did the pricey B service in February, and the next service is a 'relatively' inexpensive A service. I will not be the owner of this car for the next B service. Since Tesla said they would be filling the maximally equipped Model 3 orders first, and I don't want a $68,000 Model 3, I will wait until the wealthy early adopters get theirs, and see what the situation is. If this tariff war thing gets worse, it may be harder to buy a non-domestic automobile, so I might not be looking at another MeBe. I will guess that the tariff war thing probably won't last a year and a half, but who knows? I may be an idiot for even thinking about the Tesla, but the fact is, I probably am an idiot - I had one of the first 100,000 Corvairs, a 1970 Mercedes 220 with the brand new smog control system, and one of the first 25,000 Oldsmobile diesels. All three of them bit me. (I also have a 2015 GLA, which hasn't bitten me yet)
 

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Interesting comments above. I left my GLA in the garage for 5 weeks whilst we recently went to Japan. Started first time when we came home and everything except the Eco system was fine. I know the second battery needs a good charge as was the case with short trips when I lived in Sydney suburbia. Two return trips to Sydney in June (about 600kms) and the system started working again. Worked for 2 weeks, then nothing.

I've had batteries replaced and apparent errors fixed by 2 Sydney dealers, and in relation to all 3 "repairs", it works for less than a month each time. Now retired and living out of Sydney I put a lot more mileage on every week - and the system hasn't worked in the last 6 weeks now. Due for it's first B service next month - this time off to another dealer local to our new home.

I have no faith in the system ever working properly at all.
 

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I spent a week in Arkansas a few week ago. Came home to Arizona and my eco stop/start hasn’t worked since.


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