DETROIT, Aug 3 (Reuters) - General Motors Co (GM.N) on Tuesday said its three North American full-size pickup truck assembly plants would be shut down next week due to the global semiconductor chip shortage. The idling of the plants in Flint, Michigan; Fort Wayne, Indiana; and Silao, Mexico, comes a week after the plants resumed production following an earlier shutdown related to the chip shortage. "The global semiconductor shortage remains complex and very fluid," GM said in a statement. "The recent scheduling adjustments have been driven by temporary parts shortages caused by semiconductor supply constraints from international markets experiencing COVID-19-related restrictions." "This period will provide us with the opportunity to complete unfinished vehicles at the impacted assembly plants and ship those units to dealers," GM added. The No. 1 U.S. automaker also said its plants in Spring Hill, Tennessee, and Ramos Arizpe, Mexico, will resume production on Monday after being idled since July 19. Detroit-based GM"s Lansing Delta Township plant in Michigan will extend its downtime next week. It has been idled since July 19. GM also extended downtime at its San Luis Potosi, Mexico, and Ingersoll, Canada, plants through the weeks of Aug. 23 and Aug. 30. They had been scheduled to resume production on Aug. 23, and have been down since July 19.