General Motors  (GM) - Get Report shares on Wednesday blew a gasket after the auto giant reported a 7% decline in first-quarter deliveries.

GM's stock at last check dropped 8.1% to $19.09. 

The numbers would likely be worse but for the timing of the coronavirus-driven economic shutdown. That began gaining momentum in March, the last month of the quarter, as federal and state governments escalated social-distancing restrictions.

GM in mid-March joined other major automakers in temporarily suspending vehicle production at its plants amid rising concern about the spread of the coronavirus on factory floors. 

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GM rolled out 618,335 vehicles during the first three months, down from 665,840 during the year-earlier quarter.

Buick models took the biggest hit, with deliveries dropping more than 34%, followed by Cadillac, which fell 15%, and GMC and Chevrolet, which eased 5.3% and 3.8%, respectively.

Some bright spots: GM reported a big jump in demand for two of its most popular light-duty pickup trucks. Silverado deliveries surged more than 33% to 112,925 and sales of the Sierra rose 27% to almost 40,000.

By contrast, deliveries of the midsized Chevy Colorado pickup truck hit the brakes, dropping 36% to 21,430.

Fiat Chrysler  (FCAU) - Get Report on Wednesday reported an even bigger drop in first-quarter sales, down 10.4% to 446,768. That was off from 498,425 during the first quarter of 2019.