About 900,000 Chevy Cobalts in probe

Some 905,000 Chevrolet Cobalts built between 2005 and 2009 are the subject of a preliminary evaluation by federal officials because of complaints that drivers may lose control of the electronic power steering system.

In a filing on its Web site, the National Highway Traffic Safety Administration (NHTSA) said it has received 1,132 complaints alleging the sudden loss of control of the compact car, with 754 of the complaints received in the past six months.

NHTSA said there were 11 complaints that a sudden increase in steering effort led to a crash, with one injury attributed to the problem.

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“GM is cooperating with NHTSA in its preliminary evaluation of power steering in the 2005-2009 Chevrolet Cobalt,” said Alan Adler, a spokesman for General Motors Corp., maker of the Chevy Cobalt, in a e-mail.

Officials at NHTSA and the Department of Transportation said it’s not their policy to comment on preliminary evaluations.

NHTSA opens many preliminary evaluations each year, only some of which result in recalls.

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