General Motors (GM) has invested $167m at its new vehicles assembly plant at Spring Hill, Tennessee, US increasing the the total investment to $350m.
The auto major has announced $183m investment earlier for this plant.
To support a future mid-size vehicle program, the company will use $40m of the $167m, increasing the total investment to $223m.
GM said the new investment will create or retain approximately 1,000 jobs.
The remaining $127m will be used for a second mid-size vehicle program, which will create or retain approximately 800 jobs.
Both programs will add vehicle assembly, stamping, engine and component parts production to existing manufacturing operations at the site.
GM UAW Vice President Joe Ashton said: "I would like to thank General Motors for its confidence that the highly skilled members of UAW Local 1853 can successfully build mid-size vehicles with high quality here at Spring Hill."
The company's Spring Hill manufacturing plant is designed to supplement production for plants being retooled for new products or add production.
