Companies may have to shift more production to the U.S. or sales to other countries. Coordination among partners, though, may be difficult.

For the past few years, the annual gathering was held during warmer months. But many didn’t go for it, which may seem surprising given the typical weather in January in Michigan.

AM radio’s popularity has declined, leading some carmakers to drop the equipment. Broadcasters say their stations are crucial in emergencies.

Incentives for German automakers to build vehicles here — or penalties for imports — could inspire a shift in operations.

EVs, hybrids and plug-in hybrids made up 18% of new vehicle sales in the U.S. in the first quarter of this year. But that share was down slightly from the previous quarter.

Investors — and the union — will be scrutinizing the numbers for clues about how the extended work stoppage is affecting the companies.

Among the steps General Motors says it will take: providing additional protective gear, and taking workers’ temperatures when they arrive.

American manufacturers are eager to win Chinese customers.

Makers of hybrid and electric cars are increasing their offerings in 2013 despite a somewhat disappointing roll-out of vehicles like the Nissan Leaf and Chevy Volt.