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.

During testing, GM discovered that some of the sensing and diagnostic modules in these vehicles might have a combination of sensing components and software calibrations that could interfere with the sequence of air bag deployment signals.

Dealers will recalibrate the modules.

The second recall involves approximately 150,000 model years 2002 and 2003 Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac cars and trucks built between May and July 2002 which may have driver’s side air bag inflator modules that could fracture at a weld during deployment.

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The fault was discovered by a supplier and affects approximately 8,000 vehicles whose inflator modules will be replaced.

The vehicles involved are a varying number of 2002-03 Buick LeSabre, Cadillac DeVille, Chevrolet Impala and Monte Carlo, Oldsmobile Aurora, and Pontiac Bonneville passenger cars; Chevrolet Venture, Pontiac Montana, and Oldsmobile Silhouette minivans; Buick Rendezvous, Chevrolet TrailBlazer, GMC Envoy, and Oldsmobile Bravada sport utility vehicles.

Only vehicles built between May and July 2002 have the inflator modules that will be inspected and replaced if necessary.

GM says there have been no reports of incidents involving vehicles with the suspect air bag inflator modules.