General Motors will pay a $145.8 million penalty after a US government probe found excess emissions from approximately 5.9 million GM vehicles, Reuters reports.

In addition, the automaker will forfeit credits worth hundreds of millions of dollars.

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Auto safety regulator, the National Highway Traffic Safety Administration (NHTSA) said GM will pay a $145.8 million penalty for fuel economy compliance issues.

The firm will also cancel more than 30.6 million fuel economy credits for the 2008-2010 model years to resolve the issues identified by Environmental Protection Agency’s (EPA) light-duty vehicle in-use testing program.

In a separate statement, the EPA said GM has agreed to give up approximately 50 million metric tons in carbon allowances.

It comes after the multi-year investigation found 2012-2018 model year vehicles were emitting more than 10% higher carbon dioxide on average than GM’s initial compliance reports claimed, according to Reuters.

In a statement, GM said it “has at all times complied with and adhered to all applicable laws and regulations in the certification and in-use testing of the vehicles in-question.”

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