The practice dates back to the federal bailout in the 2000s.
Contracts with Ford, GM and Stellantis all end at the end of Thursday, and the president of the United Auto Workers union has made clear that members are prepared to strike.
The new entry-level price for a new vehicle is $25,000, auto research site Edmunds says.
EVs account for about 5% of car purchases, according to automotive website Edmunds. Rivals to Tesla are making inroads.
U.S. automakers depend on parts from Canadian manufacturers. And a lot of them cross the Ambassador Bridge.
The automotive business has its ups and downs, but union contracts protect workers from big pay cuts.
The coronavirus pandemic forced Ford, GM and Fiat Chrysler to close factories and halt production. They're expected to report large losses.
Pickup truck sales are holding up better than some other vehicles, spurred by incentives like zero-percent financing deals.
It's the automaker's third profitable quarter in a row.
Offers include seven-year interest-free loans and no payments for six months.