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General Motors reported a 12.6% rise in sales compared with the same period last year.
Ford posted a better-than-expected 3% increase in sales, helped by increasing demand for sports utility vehicles (SUVs) as well as its Fusion sedan.
Ford saw its truck sales drop 4% as it cut back on incentives in preparation for the launch of its new F-150 pick-up truck, which is the best-selling vehicle in North America.
Ford also said it was shutting down some truck plants for a total of 13 weeks in an effort to plan for the launch and manage inventory of the new truck, which features a lighter body for better fuel mileage.
May is traditionally a strong month for car sales in the US.
This May in particular was helped by an extra weekend, which saw particularly strong sales.
GM shares rose more than 3% on the news, before falling later in the day.
Source: BBC News