AP Sources: US to allege Fiat Chrysler cheated on emissions

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  • FILE - In this Thursday, Nov. 5, 2015, file photo, 2015 Jeep Grand Cherokees appear on display at a Fiat Chrysler dealership in Doral, Fla. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to disclose that software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/Alan Diaz, File)

    FILE - In this Thursday, Nov. 5, 2015, file photo, 2015 Jeep Grand Cherokees appear on display at a Fiat Chrysler dealership in Doral, Fla. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to disclose that ... software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/Alan Diaz, File) (The Associated Press)

  • FILE - In this Jan. 5, 2015, file photo, Ram pickup trucks are on display on the lot at Landmark Dodge Chrysler Jeep RAM in Morrow, Ga. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to disclose that software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/John Bazemore, File)

    FILE - In this Jan. 5, 2015, file photo, Ram pickup trucks are on display on the lot at Landmark Dodge Chrysler Jeep RAM in Morrow, Ga. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to disclose that ... software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/John Bazemore, File) (The Associated Press)

  • FILE - In this Tuesday, May 6, 2014, file photo, a vehicle moves past a sign outside Fiat Chrysler Automobiles world headquarters in Auburn Hills, Mich. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to disclose that software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/Carlos Osorio, File)

    FILE - In this Tuesday, May 6, 2014, file photo, a vehicle moves past a sign outside Fiat Chrysler Automobiles world headquarters in Auburn Hills, Mich. On Thursday, Jan. 12, 2017, the U.S. government alleged that Fiat Chrysler Automobiles failed to ... disclose that software in some of its pickups and SUVs with diesel engines allows them to emit more pollution than allowed under the Clean Air Act. The Environmental Protection Agency said in a statement that it issued a "notice of violation" to the company that covers about 104,000 vehicles, including the 2014 through 2016 Jeep Grand Cherokee and Dodge Ram pickups, all with 3-liter diesel engines. (AP Photo/Carlos Osorio, File) (The Associated Press)

The U.S. government is accusing Fiat Chrysler of violating the Clean Air Act on some of its diesel engines, according to two people briefed on the case.

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The Environmental Protection Agency has scheduled a news conference for Thursday morning to release details and make an announcement regarding a "major automaker."

The EPA will issue a notice of violation to Fiat Chrysler, but it wasn't clear exactly what the agency was alleging, said the people, who asked not to be identified because the formal announcement hasn't been made.

The announcement comes one day after Fiat competitor Volkswagen pleaded guilty in federal court to criminal charges related to widespread cheating involving emissions tests with its "Clean Diesel" line of vehicles. Six high-ranking VW executives have been charged in the scandal. VW agreed to pay a record$4.3 billion penalty for cheating on emissions tests.

Fiat Chrysler owns Dodge, Jeep and Ram Trucks, among other global brands. It offers diesel engines as an option on its best-selling Ram pickup and popular Jeep Grand Cherokee as well as other models.