GM Pressed by U.S. to Provide Details on Delayed Recall

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The U.S. told General Motors Co. to detail what it knew, and when, about ignition-switch failures linked to 13 deaths that led the nation’s largest automaker to recall 1.6 million Chevrolet, Pontiac and Saturn vehicles.

The National Highway Traffic Safety Administration sent GM a 27-page order requesting specifics, by April 3, on steps the company took to investigate engineering concerns and consumer complaints dating from 2004. GM last month said heavy key rings or jarring can cause ignition switches on some cars to slip out of position, cutting off power and deactivating air bags.