Start-Stop: How The System That Automatically Shuts Off The Engine Affects Fuel Consumption And Car Durability

Written by Carla Teles

Published on 21/08/2025 at 19:57

Seu carro desliga sozinho no trânsito? Entenda o que é o sistema start-stop, como funciona, se economiza combustível de verdade e se estraga a bateria.

35 people reacted to this.

Understand The Feature That Turns Off The Car Engine At Stops To Reduce Pollutant Emissions And See If It Really Helps Save Fuel.

Many drivers of modern cars have already noticed something: the engine turns off by itself at stops, such as at traffic lights. When accelerating, it starts working again. This is the start-stop system. But what is it for? Does it help save? Is it possible to turn it off? We will explain everything below.

What Is The Start-Stop System And How Did It Come About?

The start-stop is an electronic system present in newer cars. Its function is to automatically turn off and turn on the engine under specific conditions. The technology emerged to meet a need. Manufacturers needed to reduce the emission of polluting gases. The system is a tool to meet global energy efficiency goals.

How Does Start-Stop Work In Practice?

Demonstrated by the letter "A" in a circle. — Demonstrated by the letter “A” in a circle.

The operation of the start-stop depends on several sensors. They monitor the engine, the battery, the steering, and even the seatbelt. An electronic control unit analyzes this information. The engine only turns off when the system confirms that the stop is safe for the occupants.

ARTICLE CONTINUES BELOW

What Is The Main Function Of Start-Stop?

The main function of start-stop is to reduce pollutant emissions. Automakers use the feature to comply with environmental laws. Keeping the engine running releases gases into the atmosphere, even when the car is stopped. The system is designed for the heavy traffic of cities. In the “stop-and-go” of urban centers, it helps to reduce local pollution.

Does The Start-Stop System Really Save Fuel?

Yes, the start-stop also helps save fuel. An idling engine consumes fuel without moving the car. The system eliminates this waste by turning off the engine. A study by SAE International showed that savings vary. In tests, cars became between 7.3% and 26.4% more economical, depending on the driving cycle.

Is It Possible To Turn Off Start-Stop? And Does It Damage The Battery?

Many drivers prefer not to use the system. This happens because the air conditioning loses power when the engine turns off, since the compressor is powered by the engine. For this reason, almost all cars offer an option to deactivate start-stop. Generally, there is a button on the dashboard. It is identified by the letter “A” inside a circular arrow.

As for the battery, the idea that start-stop damages it is a myth. Cars with this technology use special and reinforced batteries. They are designed to withstand multiple charge cycles. Therefore, the system does not damage the battery, but it is important to know that these special batteries have a higher cost than conventional ones.

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9 Comments

most recent

older Most voted

Nicodemos

#160370

22/08/2025 20:04

Tenho um Kwuid que trabalho com Uber. A economia é enorme. Discordo totalmente desses comentários de quem nem usa mas quer criticar. Ele nem tem tempo pra desligar mas é sensível aos pedais. Quando uso a 99, o consumo chega a ser menor, porque o app tem os principais semáforos com a contagem de tempo. Faço média de 15 km com álcool na cidade.

-1

Respond

Evandro Ficagna

#160305

22/08/2025 16:38

Não tem utilidade nenhuma, além das peças do sistema serem muito carras. A economia proporcionada é quase nula no final de um mês.

-2

Respond

Ramon vicenzo

#160304

22/08/2025 16:34

Não adianta nada fica só 30 s a 1 minuto,

Respond

Start-Stop: How The System That Automatically Shuts Off The Engine Affects Fuel Consumption And Car Durability

Understand The Feature That Turns Off The Car Engine At Stops To Reduce Pollutant Emissions And See If It Really Helps Save Fuel.

What Is The Start-Stop System And How Did It Come About?

How Does Start-Stop Work In Practice?

What Is The Main Function Of Start-Stop?

Does The Start-Stop System Really Save Fuel?

Is It Possible To Turn Off Start-Stop? And Does It Damage The Battery?

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Start-Stop: How The System That Automatically Shuts Off The Engine Affects Fuel Consumption And Car Durability

Understand The Feature That Turns Off The Car Engine At Stops To Reduce Pollutant Emissions And See If It Really Helps Save Fuel.

What Is The Start-Stop System And How Did It Come About?

How Does Start-Stop Work In Practice?

What Is The Main Function Of Start-Stop?

Does The Start-Stop System Really Save Fuel?

Is It Possible To Turn Off Start-Stop? And Does It Damage The Battery?

Mother and daughter build a 70 m² house with more than 8,000 discarded glass bottles and impress with their creativity; known as the Casa de Sal, the property is located on Itamaracá Island, in Pernambuco.

Workers were opening a new road connection near the Marginal Tietê when they found, in the underground of the construction site, remnants of locomotives, wagons, and boilers from the 19th century linked to the forgotten history of Lapa.

Instead of burning or burying old tires, an American city is transforming about 2,000 of them into the street itself, paving its first sections with a quieter and more durable rubber asphalt.

China transforms desert-devastated area into the world’s largest artificial forest, planting trees for 60 years, blocking sand that reached Beijing, and creating a “green lung” of 92,000 hectares in a region once considered lost.

Greek island offers free housing for volunteers, but there’s a condition: you need to take care of rescued cats.

He transformed an abandoned plastic water tank into an underground house in the “hobbit hole” style, using only repurposed pallet wood, without heavy machinery or expensive labor.

China has deployed snake-shaped robots to slide along power lines, where they have already inspected over 130 kilometers of cables using cameras and sensors to detect damaged wires, worn-out parts, and overheating.

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