How To Activate Mercedes Eco Start/Stop

Have you ever wondered how to activate the Mercedes Eco start/stop feature? There are certain activation conditions that must be met in order to use this feature, and we have researched what these activation conditions are.

Assuming that all activation conditions are met, the Mercedes Eco Start/Stop feature can be automatically activated. With this feature, the engine automatically shuts off if the vehicle is stationary for a certain amount of time, and restarts automatically if the driver steps on the gas pedal or shifts to reverse transmission. You also have the option to manually activate or deactivate it through a button in the console.

The ECO start/stop feature helps reduce fuel consumption and emissions by maximizing the efficiency of your Mercedes Benz engine. Keep reading to learn the activation conditions so you can get started with the ECO start/stop feature on your Mercedes.

What Are the Mercedes Benz ECO Start/Stop Activating Conditions?

The following are the activating conditions of the Mercedes ECO start/stop feature:

  • Engine temperature
  • Battery charge level
  • Flat terrain
  • Seatbelt use
  • Doors
  • Climate control temperature

Engine temperature

The engine needs to be at an optimal temperature because the feature relies on the engine's ability to quickly and efficiently restart when the driver presses the accelerator. If the engine is too cold, it may not be able to start up as quickly or smoothly.

This could negatively impact the driving experience. Additionally, starting a cold engine could also cause more wear and tear on the engine.

Battery charge level

The Mercedes ECO start/stop feature requires a good battery charge level in order to function properly because it uses the car's battery to power the starter motor and engine during the start-stop process.

If the battery is not fully charged, it may not have enough power to start the engine, which can lead to the feature not working properly or not working at all. This is also why it's important to maintain your car's battery and keep it in good condition.

Flat terrain

When your Mercedes is on a slope, the engine may need to be running in order to maintain control of the vehicle and prevent it from rolling. Therefore, the feature is deactivated when the vehicle is on a slope to ensure safety and stability.

Mercedes-Benz E 220 2016 cockpit interior details cabin

Seatbelt use

To ensure the safety of the occupants, the feature is programmed to only activate when the driver and passengers have unfastened their seatbelts. This is to prevent the engine from restarting unexpectedly and potentially causing the passengers to be thrown forward or out of their seats. 


To prevent the engine from turning on or off unexpectedly, the car's computer system is designed to only activate the feature when the car's doors are open. This ensures that the engine will only turn on or off when somebody is in the car. Besides, it just doesn't make sense for the ECO to activate when the doors are closed. The car has to detect somebody opening the door, entering inside it, and closing it.

Climate control temperature

Climate control temperature plays a role in the activation of the Mercedes ECO start/stop feature in that the system will not activate when the AC or heating is in use.

When the climate control is set to a certain temperature, the engine will not turn off when the car is idling because the system needs to maintain the temperature inside the vehicle. This explains why climate control temperature prevents the engine from turning off in the middle of the heating or cooling process. 

In case one of the above activation conditions is not met, the feature will be canceled and the engine will continue running as normal. You can also manually activate/deactivate this feature using a button. The ECO button is labeled "A" within a circular arrow or simply "ECO".

What Transmission Mode Should I Choose To Find ECO Mode in Mercedes Vehicles?

Mercedes Benz GLC 250 4MATIC 2016 cockpit interior details cabin set, How To Activate Mercedes Eco Start/Stop

Generally, the ECO mode is active in E-mode for most Mercedes vehicles. For AMG models, it's in the C-mode. You'll find the ECO mode active in all modes of the Agility select models except in the Sport Plus mode, which deactivates it.

Is It Safe To Use ECO Mode at All Times Assuming All Activation Conditions Are Met?

It is generally considered safe to use the ECO start/stop feature on a Mercedes vehicle at all times, but in short distances only like city driving where you'll have to deal with lots of street intersections and traffic lights.

Additionally, it's important to keep in mind that the start/stop system may not function optimally or at all in extreme temperatures or other adverse conditions. 

What Are Some Of The Disadvantages Of ECO Mode?

ECO mode is a feature that is designed to optimize fuel efficiency and minimize your carbon footprint. However, in some driving conditions, it may not be the best option. For example, on slippery roads or when towing a trailer, ECO mode may reduce power and responsiveness, making it harder to maintain control of the vehicle.

Additionally, ECO mode may not provide enough response time when merging onto the highway. Therefore, some automotive technicians may advise against using ECO mode in these types of driving conditions.

Check out this Mercedes ECO Start/Stop Module for 2011 to 2017 models on Amazon.

Reasons Why Mercedes ECO Mode Won't Activate

electromagnetic crankshaft position sensor and transmission oil pump, How To Activate Mercedes Eco Start/Stop

Mercedes has a couple of reasons why ECO mode won't activate. One of them is that it may have been turned off manually or there could be a hardware issue with the system. The carmaker recommends turning it back on and trying again.

There are two major hardware components that are responsible for activating ECO mode. A failure of any one of them could result in it not working. 

Crankshaft hall sensor

If the crankshaft hall sensor in a Mercedes vehicle equipped with ECO mode is faulty, it can cause the engine to run poorly or not start at all.

The sensor is responsible for providing the engine control module with information about the position of the crankshaft, which is used to control engine timing and ignition.

Without this information, the engine may not be able to properly synchronize fuel injection and ignition, leading to poor performance or no start.

Electric transmission oil pump

If the additional electric transmission oil pump of the Mercedes ECO mode is faulty, it can cause issues with the transmission system, such as difficulty shifting gears, or potentially cause damage to the transmission if not addressed.

The need for an additional electric transmission oil pump in the ECO mode is to improve the efficiency of the transmission. The pump helps to maintain the appropriate oil pressure in the transmission, which can help to reduce friction and improve the overall efficiency of the system.

This, in turn, can lead to improved fuel economy and a reduction in emissions. Additionally, it can help in maintaining the smoothness of the gear shifting and reduce the internal heat generated while driving in ECO mode.

Check out this Mercedes ECO Start/Stop Module for 2018 to 2021 models on Amazon.

How Much Fuel Can I Save From ECO Mode? Is It Worth the Hype?

Car manufacturers may claim that their cars can save you fuel by up to 12% when using ECO mode, but research suggests that the actual fuel savings achieved in ECO mode may be lower, around 7%. This could be due to a variety of factors, such as the specific driving conditions, the driver's habits, and the way the test was conducted.

Higher-end luxury cars like Mercedes may have more advanced technology and engineering, which can contribute to higher fuel efficiency in ECO mode compared to lower- to mid-range cars like Toyota.

These cars may have more efficient engines, advanced aerodynamics, and advanced transmission systems. Additionally, luxury cars may be designed to prioritize fuel efficiency and performance, while lower-priced cars may have more of a focus on affordability.

It's also worth noting that the manufacturers' claims might be based on ideal conditions and test results, while the research results might be based on real-world usage which may not be as efficient as the ideal test results.

close up Audi R8 V10 2010 Interior Photos

Can You Easily Switch From ECO Mode to Sport Plus Mode in Mercedes Vehicles?

Yes, it is typically possible to switch from ECO mode to Sport Plus mode in a Mercedes vehicle and vice-versa. ECO mode is typically a fuel-efficient driving mode that limits the vehicle's power output, while Sport Plus mode is a performance-oriented driving mode that increases the vehicle's power output and sharpens its handling characteristics.

The exact method for switching between these modes will vary depending on the make and model of the vehicle. Mercedes vehicles, particularly the Agility select models, have a wide selection of buttons on the console in the central dash or near the COMAND controller, while others may require the driver to use the vehicle's infotainment system to make the change.

Is It Safe In the Transmission System to Change Drive Modes While Driving?

It is important to note that switching from a performance-oriented mode, such as Sport Plus mode, to a more fuel-efficient mode, such as ECO mode, may cause the transmission to shift to lower gears abruptly, which could result in increased wear and tear on the transmission.

Mercedes-Benz v-class, close-up of the dashboard, buttons.

What Happens If I Speed Up in ECO Mode Faster Than I Should?

Your acceleration is restricted when you drive in ECO mode. ECO mode in a vehicle is designed to optimize fuel efficiency by making adjustments to the engine and transmission.

One of the ways it does this is by limiting the amount of power available for acceleration. This means that the vehicle will not accelerate as quickly in ECO mode, but it will use less fuel overall. This is a trade-off between performance and efficiency.

In Closing

Mercedes Benz GLC 250 4MATIC 2016 cockpit interior details cabin set

After reading the article, you should have known by now how activating the Mercedes ECO start/stop feature is key to optimizing your fuel efficiency. We also discussed the activation conditions that you must meet in order to use this feature. We hope that this post has provided you with enough information so that you can activate the ECO start/stop feature on your Mercedes Benz and contribute to a greener environment.

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