The recall involves 1999-2000 models of the Chevrolet Silverado and GMC Sierra trucks. GM said there have been 84 injuries, most of them minor scrapes and bumps, but no crashes or deaths linked to the problem.
GM, the world's No. 1 automaker, said the galvanized, braided-steel support cables that keep the tailgates in place can corrode or fracture over time because of moisture seeping through cracks in the plastic sheathing of the cable or entering between the cable's metal strands.
The automaker had recalled about 4 million 2000-2004 pickups worldwide in March 2004 because the tailgates could break without warning. The recall involved a broader range of vehicles, including the Chevrolet Silverado, GMC Sierra, Chevrolet Avalanche and Cadillac Escalade EXT trucks.
GM spokesman Alan Adler said the vehicles covered by the new recall had different materials used in the support cables and involved fewer complaints. He said the automaker decided to issue the recall after "an exhaustive investigation."
"We worked with (the National Highway Traffic Safety Administration) and agreed to do the recall to get this behind us," Adler said.