The delay in production and shipments was first reported by Motor Authority.

The F-150 Lightning is a key part of Ford’s plans to produce 600,000 EVs annually by the end of this year, and 2 million by 2026. Ford recently added a third shift at the Rouge plant as it works to boost production to 150,000 Lightnings by the end of the year.

CEO Jim Farley has said the product would likely determine whether the U.S. was ready to fully embrace EVs.

Ford, however, has been plagued by quality issues and trouble on many of its highest-profile products. Last year, Ford issued a stop-sale on the Mustang Mach-E as it recalled nearly 50,000 crossovers over a safety defect that could cause it to lose power.

Farley earlier this month blamed long-standing execution issues, including high costs and quality issues, as the reason why Ford lost $2 billion in 2022.