| The recall, which covers vehicles built since 
				2014 including some Cadillac Escalade, Chevrolet Silverado, GMC 
				Sierra, Chevrolet Suburban and GMC Yukon vehicles, is because 
				the amount of vacuum created by the vacuum pump may decrease 
				over time, GM told the National Highway Traffic Safety 
				Administration (NHTSA) in documents posted Wednesday.
 NHTSA opened a preliminary investigation into the issue in 
				20128.
 
 (Reporting by David Shepardson; Editing by Susan Fenton)
 
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