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Volvo Group said it could not yet determine the impact of a faulty component on its North American trucks as it was still evaluating the scope of the problem.

Volvo, the world’s second-largest truckmaker, has uncovered a faulty component in the emissions-control setup of vehicles widely sold in Europe and the U.S., the manufacturer’s biggest markets.

California is considering a formal, public counter-proposal to President Donald Trump’s proposed rollback of fuel and pollution requirements for cars and trucks.

To test how Americans feel about its plan for rolling back car and truck pollution standards, the Trump administration will hold an initial public hearing Sept. 24 in Fresno, Calif., a place where it might reasonably expect a friendly response.

Fleets continue to encounter challenges dealing with aftertreatment technologies that are now being refined after major changes in years past. From a maintenance perspective, aftertreatment systems are improving.

DENVER — The Trump administration is rolling back some U.S. regulations on climate-changing methane pollution, calling them expensive and burdensome, but Colorado says its rules are working — and they have industry support.

The Trump administration’s plan to ease vehicle-emission mandates lifts some burdens for automakers but also would strip away options that have made it easier for them to comply and have encouraged the development of electric cars.

The Trump administration will seek to revoke California’s authority to regulate automobile greenhouse gas emissions — including its mandate for electric car sales — in a proposed revision of Obama-era standards, according to three people familiar with the plan.

Talks between the U.S. and California on auto emissions standards have made little progress since President Donald Trump told his agencies to pursue a deal, according to a top state official, who’s holding out hope that the Environmental Protection Agency will get more involved.