General Motors' U.S. sales fell an estimated 5.5 percent in December, driven by declines at all four brands and the phaseout of several car nameplates.
The automaker's light-vehicle deliveries dropped to about 280,710 year over year, according to the Automotive News Data Center.
For all of 2019, GM's U.S. sales dipped 2.3 percent to 2.9 million.
Despite an estimated 7.6 percent decline in December, Cadillac sales rose 1 percent on the year, the brand's first increase since 2015.
GMC sales dipped an estimated 5.4 percent in December on weaker results for the Acadia large crossover and Yukon large SUV but finished the year with their highest volume since 2004.
Chevrolet deliveries fell an estimated 4.9 percent in December, resulting in a fourth consecutive annual decline.
Buick deliveries fell an estimated 11 percent in December, including declines for the Enclave large crossover and Envision compact crossover.
Car sales for all GM brands plunged 20 percent last month, while light-truck sales dipped 3 percent, according to estimates from the Data Center.
Total GM deliveries in 2019 included more than 1 million crossovers for the second consecutive year, up 13 percent from 2018, and more than 1 million full-size pickups and SUVs.
Brands: Buick, down 11%; Cadillac, down 7.6%; Chevrolet, down 4.9%; GMC, down 5.4% (all estimates)
Notable nameplates: Buick Enclave, down 22%; Encore, up 6%; Cadillac CT6, up 17%; Escalade, down 25%; Escalade ESV, up 17%; XT4, down 31%; XT5, down 23%; Chevrolet Bolt, down 51%; Corvette, up 22%; Silverado, down 9.4%; Trax, up 74%; Equinox, down 0.7%; GMC Acadia, down 20%; Sierra, up 3%; Terrain, up 1% (all estimates)
U.S. market share: 16.9% in 2019 v. 17.1% in 2018
Incentives: $4,817 per vehicle, down 4.7% from a year earlier, ALG says, equal to nearly 13% of the average transaction price.
Average transaction price: $38,073, up 0.5% from a year earlier, according to ALG.
Fleet mix: 19.7% in the fourth quarter, down from 20% a year earlier.
Inventory: 616,023 vehicles at the end of December, down 18% from a year earlier.
Quote: "We've focused our resources on what our customers want — crossovers and trucks — and that has paid off," Kurt McNeil, vice president of U.S. sales operations, said in a statement. "We're pleased with our full-size pickup launch and we look forward to launching our segment-leading, all-new full-size SUVs in 2020."
Did you know? GM has sold more full-size and midsize pickups combined in the U.S. than any other automaker for six consecutive years, according to the company.