Volkswagen can't yet confirm the number of cars that will need hardware fixes.
There are still about 250 wrongful death and injury lawsuits pending.
The agreement promises $9 billion in U.S. plant investments over four years.
More than a dozen cars of a train loaded with crude oil jumped the tracks Sunday afternoon.
The Institution of Chemical Engineers also found there were more than 600 serious injuries.
Volkswagen already is offering $2,000 to current VW owners to trade in their cars.
If approved, the port would be up and running in 2018.
The company will keep the Weyerhaeuser name and have more than 13 million acres of timberland.
The pipeline was projected to carry 800,000 barrels a day from Canada and North Dakota.
The Greenpeace protest comes after VW announced that it "understated" CO2 emissions.
Volkswagen said the retirement wasn't connected to the emissions scandal.
Obama is hoping to become the first president to treat climate change as a top-tier issue.
The spills included more than 18,000 gallons of ethanol and less than 1,000 gallons of oil.
The inquiry looks at whether public statements disagreed with the findings of researchers.
The rear grab rail brackets could interfere with the deployment of a side curtain air bag.
CO2 levels rose to nearly 398 parts per million, from 396 ppm in 2013.
The new analysis assumes that emissions cuts will drop faster after 2030 than was assumed in previous reports.
If approved, the four-year contract would cover 52,600 GM factory workers.
About 40 IT workers were laid off last month, but this week's cuts are expected to affect many more employees.