Tesla struggled to produce its cheapest model shortly after the car debuted, setting back Chief Executive Officer Elon Musk's mission to reach mainstream consumers.
The automaker built only 260 Model 3s during the quarter ended in September, less than a fifth of its 1,500-unit forecast. Output of the sedan that starts at $35,000 -- roughly half the cost of the least expensive Model S -- was lower than expected because of unspecified "bottlenecks," according to the company.
Musk has engendered enthusiasm about the future of electric cars and has automakers including Volkswagen, General Motors and Daimler lining up to compete. But what Tesla hasn't done is prove itself as a mass manufacturer.
The slow start for Model 3, which was designed for easier assembly, reignites concern it will struggle to reach the lofty production targets set by its CEO.
"I would be surprised if anyone was surprised that they came up short," said Sam Korus, an analyst at Ark Investment Management in New York, which holds Tesla shares. "When Musk gives a prediction, you know it's an extraordinarily ambitious goal."