The industry was hurt by Beijing's decision to extend January's Lunar New Year holiday in order to keep families at home and reduce chances that infection might spread. That kept factories and dealerships closed.
Demand already was weak due to consumer jitters about a tariff war with Washington, slower economic growth and possible job losses. Sales fell 9.6 per cent last year, their second annual decline.
January's slump looks even worse due to the timing of the holiday, when shops and factories close two weeks. This year's shutdown fell entirely in January, while half was in February last year.
February sales usually would look stronger because the holiday has ended, but automakers have yet to restart production halfway through the month. The public has been told to avoid crowds, keeping customers away from dealerships.
"In the short run, auto production and sales will be greatly affected," CAAM said. "The components supply system will be disrupted."
Losses to Chinese industry due to the most sweeping anti-disease measures ever imposed are expected to be so large that forecasters have cut this year's economic growth outlook.
The sales slump is a blow to global automakers that are counting on China to drive revenue amid flat demand in the United States and Europe.
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China accounts for 27 per cent of global auto production, up from 7 per cent in 2003, according to UBS.
The extended closure of factories also is disrupting the global flow of auto components. China's share of global exports of auto parts is about 8 per cent, up from 1 per cent in 2003, according to UBS.
The slump is squeezing revenues for global and Chinese auto brands at a time when they are spending billions of dollars to develop electric vehicles under pressure to meet government sales targets.
Sales of electric and gasoline-electric hybrid passenger vehicles tumbled 54.5 per cent in January to 39,000, CAAM said.
China is the biggest market for electrics, accounting for half of global sales, but demand plummeted when Beijing ended multibillion-dollar subsidies in mid-2019.
Forecasters expect demand to rebound later in the year. We expect many customers are merely postponing their purchase and that long-term demand growth remains largely unaffected, Gerwin Ho of Moody's Investors Service said in a report last week.