Mary Barra met with employees during unannounced visit to Toledo Transmission Plant.
Lower sales, write-down associated with new venture, part of reason for decline.
British lawmaker Justin Tomlinson confirmed news in series of tweets.
Select 2011-2013 model year trucks with six-speed automatic transmission are affected.
Source: Deal would value Rivian at between $1 billion and $2 billion.
Company statement: ‘We have zero tolerance for discrimination — this is not who we are.’
Fans again coo over the Jeep Gladiator.
GM shifts employees to local facility.
The Italian American automaker says fourth-quarter net profits rose by 61 percent.