EPA scraps the reason 60% of new cars kill their engines at red lights

EPA ends credits behind start-stop systems

The EPA just pulled the plug on the federal credits that pushed automakers to install start-stop technology in new cars.

On Feb. 12, 2026, EPA Administrator Lee Zeldin made the announcement at the White House alongside President Trump. Zeldin called start-stop an “almost universally hated” feature and referred to it as the “Obama switch.”

He said the credits are now “over, done, finished.” The move is part of what the administration calls the largest deregulatory action in U.S. history.

How start-stop technology works

If your car shuts off every time you hit a red light, you already know this feature.

Start-stop automatically kills the engine when the car comes to a complete stop, then fires it back up when you lift off the brake or press the gas. The idea is to save fuel and cut emissions during idling.

About 60 percent of new cars now have the system. Most let drivers turn it off with a button, but it switches back on every time you restart the car.

Why automakers installed the feature

Start-stop was never legally required in the United States.

Automakers chose to add it because the Obama EPA created a system of “off-cycle credits” in 2012 that rewarded fuel-saving features not captured in standard lab testing.

Companies earned compliance points toward meeting greenhouse gas standards by installing the technology. Start-stop was one of several features that qualified.

Solar panel roofs, energy-efficient lighting, and improved air conditioning systems also earned credits under the program.

EPA calls credits a regulatory loophole

The EPA says the off-cycle credit system was a “regulatory loophole” that did not deliver real emission reductions. The agency claims the change could save car buyers an average of $2,400 per vehicle.

The White House estimates total savings of $1.3 trillion from the broader regulatory rollback.

Zeldin said automakers should not earn rewards for technologies he described as merely a “climate participation trophy.” The agency framed the move as a win for consumers.

Studies show the systems do save fuel

Independent research tells a different story about the technology’s value.

A 2023 Society of Automotive Engineers study tested four vehicles across three driving cycles and found fuel economy improved by 7.27 percent in city driving.

In heavy stop-and-go traffic, the improvement jumped to 26.4 percent.

A 2014 AAA study found savings of 5 to 7 percent, worth up to $179 a year for a driver covering 15,000 miles at 20 miles per gallon. Savings drop on highways where the engine rarely shuts off.

Part of a much bigger regulatory rollback

The start-stop credit change is just one piece of a sweeping move by the EPA.

The agency repealed the 2009 Greenhouse Gas Endangerment Finding, which determined that six greenhouse gases threaten public health and welfare.

That finding served as the legal foundation for all federal climate regulations on vehicles and other sources.

The EPA also eliminated all greenhouse gas emission standards for light, medium, and heavy-duty vehicles covering model years 2012 through 2027 and beyond.

How the Endangerment Finding got started

The roots of this policy go back almost two decades. In 2007, the Supreme Court ruled in Massachusetts v. EPA that greenhouse gases qualify as air pollutants under the Clean Air Act. The court directed the EPA to determine whether those gases endanger public health.

Two years later, the Obama administration issued the Endangerment Finding, covering carbon dioxide, methane, and four other greenhouse gases.

That finding became the legal basis for vehicle emission standards and broader climate regulation.

Automakers responded favorably to the change

Major automakers lined up behind the decision. Ford said it appreciates the effort to address the gap between current emissions standards and customer choice.

Stellantis said the move allows the company to keep offering a broad range of vehicles.

The Alliance for Automotive Innovation called existing emissions rules “extremely challenging,” given the current demand for electric vehicles. No major automaker publicly opposed the rollback.

Critics say the move will backfire

Environmental groups pushed back hard. The U.S. Climate Alliance, a coalition led by state governors, called the repeal “unlawful” and said it ignores basic science.

Environmental organizations say the rollback dismisses established research on climate change.

Independent economic analyses have found that fuel efficiency standards save consumers money over a vehicle’s lifespan through lower fuel costs.

Transportation accounts for about 28 percent of U.S. greenhouse gas emissions, the largest share of any sector.

Legal battles are expected to follow

Environmental groups and state governments have signaled they will challenge the Endangerment Finding repeal in court. The 2009 finding has been upheld by federal courts multiple times.

The Supreme Court declined to hear a challenge to it as recently as 2023. Legal experts say court battles could take years and may reach the Supreme Court again.

The legal fight will likely determine whether the rollback survives long-term.

Start-stop may not disappear overnight

Automakers are not expected to immediately strip start-stop from their vehicles.

Cars are designed for global markets, and many countries still enforce strict emission rules that make the technology valuable. Removing the system only for American-market vehicles may not be cost-effective.

But future models may ship with start-stop turned off by default or offer it as an option rather than standard equipment.

The feature could gradually fade from lower-priced vehicles where the cost is harder to justify without credits.

What this means for car buyers

Drivers who dislike start-stop may see the feature disappear or become easier to permanently turn off in future models.

The EPA says new cars could cost less without the regulatory burden, though independent analysts dispute that claim. Drivers who rely on start-stop for fuel savings in city driving may lose that benefit down the road.

The broader rollback of emission standards could also affect future fuel economy requirements. The changes will not affect cars already on the road.

This article was created with AI assistance and human editing.

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