Automakers including General Motors Co. and Hyundai Motor Co. reported a jump in US auto sales as the threat of price hikes from President Donald Trump’s tariffs drove consumers to showrooms.

GM’s deliveries soared 17% in the first quarter, with a 15% gain in retail volume, the company said Tuesday. Ford Motor Co. saw retail sales rise while Toyota Motor Corp. reported slight growth in the first three months of the year.

Researchers including Edmunds and Cox Automotive had predicted volumes would be likely boosted by anxious shoppers trying to get ahead of higher prices stemming from new US tariffs on imported vehicles, which go into effect this week.

“The prospect of tariffs is already beginning to affect the industry,” Thomas King, president of data and analytics at JD Power, said in a statement. March results were “particularly strong, enabled by consumers accelerating purchases to avoid potential tariff-related price increases.”

Among the first to report results was Hyundai, which saw record sales for the latest month and quarter, buoyed by double-digit gains in demand for its best-selling Tucson small SUV and Elantra compact sedan. For the first three months, Hyundai said Tuesday that it saw a 10% gain in deliveries to 203,554 vehicles, boosted by a 13% jump last month.

Sister brand Kia Corp. similarly posted record sales, with an 11% rise in the January to March period to 198,850 vehicles. Buyers snapped up compact Sportage SUV and new K4 sedan.

GM’s sales in March were strong, a company spokesman said, though it’s difficult to quantify how much came from buyers trying to get ahead of Trump’s tariffs. The Detroit-based automaker’s big gains came from freshened versions of the Chevrolet Colorado mid-size pickup, which was up 73%, while sales of the Chevy Traverse mid-sized SUV rose 62%.

Toyota sales grew 7.7% in March, but less than 1% in the year-to-date period. Deliveries of the Japanese automaker’s best-selling RAV4 compact SUV and Camry midsize sedan declined during the latest month and quarter. But sales of Lexus luxury brand vehicles rose 5.8% in March and 14% in the January-March period.

Ford saw a 5% quarterly gain in retail sales and 19% jump in March alone. But overall volume slipped 1.3% in the first quarter to 498,480 units, excluding heavy trucks. That was largely due to lower rental fleet sales and the discontinuation of two models, the company said.

Honda reported a 5% gain in first—quarter sales and a 13% jump in March across its namesake brand and Acura luxury vehicle lines. Deliveries of the Japanese carmaker’s top-selling CR-V crossover gained 9% in the quarter and 24% last month.

Tesla Inc. is expected to detail its global delivery numbers for the period on Wednesday.

The quarter could be the last one of relative normalcy before the industry is upended by 25% tariffs on passenger-vehicle imports, which make up about half of the US market. Even cars that aren’t imported typically use a significant amount of non-US parts, some of which may also be subject to levies.

Representatives of several large US automakers have been lobbying the Trump administration to exclude certain low-cost car components from the planned tariffs, Bloomberg News reported Monday.

While it’s not clear how new costs will be distributed between automakers, suppliers and car buyers, prices are expected to rise considerably. A recent study by Anderson Economic Group found that the tariffs could increase the cost to build vehicles by as much as $12,000. That could make some models unviable in the US, particularly at the lower end of the market.

Sales of Chevy’s South Korea-made Trax small SUV rose 57%. That vehicle faces a 25% tariff starting April 3.

GM’s electric-vehicle sales nearly doubled in the quarter, led by its Mexico-made Chevy Blazer and Equinox EVs. Those models would be hit by tariffs on their non-US parts content if Trump sticks to his original plan.

Dealers have seen a surge in demand from would-be buyers worried about prices. Chevrolet dealer Duane Paddock said GM sent an unusually large amount of inventory to meet the buyer interest. A Hyundai sales executive recently sent a memo to retailers suggesting business could set records.

US dealerships are sitting on about 60 to 90 days of inventory on average, providing them with a cushion against the immediate effects of the tariffs.

“It has created an urgency to buy it now before there’s a price increase,” Rhett Ricart, a dealer of Ford, Chevrolet, Hyundai and other brands in Columbus, Ohio, said.