General Motors will pay a $145.8 million penalty after a government investigation found excess emissions from approximately 5.9 million GM vehicles, sources told Reuters.

The Environmental Protection Agency is set to announce GM has agreed to give up approximately 50 million metric tons after the multi-year investigation found vehicles from the 2012-2018 model years were emitting more than 10% higher carbon dioxide on average than GM’s initial compliance reports claimed.

The National Highway Traffic Safety Administration plans to announce GM will pay a $145.8 million penalty for fuel economy compliance issues and cancel more than 30.6 million CAFE credits for the 2008-2010 model years to resolve the issues identified by EPA's light-duty vehicle in-use testing program, the sources added.