NHTSA Asked to Investigate More GM Air-Bag Failures

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General Motors Co., in the midst of recalling 2.6 million small cars for an ignition-switch flaw that can deactivate air bags, also may have an air-bag defect connected to deadly accidents in its Chevrolet Impala, a safety group said.

The Center for Auto Safety, in a letter to U.S. regulators today, cited a government petition by a former GM researcher who said he found a software fault that can misread a passenger’s weight and render frontal air bags inoperative. The consultant, Donald Friedman, is asking the U.S. National Highway Traffic Safety Administration to open a defect investigation into 2003-2010 model-year Impalas.