General Motors yesterday announced two separate recalls of almost 720,000 cars and trucks that have airbags that may not deploy properly in a crash. The first affects about 570,000 model year 2000 Chevrolet Silverado pickups and Tahoe/Suburban sport utility vehicles and GMC Sierra pickups and Yukon/Yukon XL sport utility vehicles built between February 1999 and February 2000 which may have a faulty module that could could result in the non-deployment of driver and passenger side air bags during certain frontal collisions.