Safety regulators will begin a formal investigation of the fire risk of Chevrolet Volts after two of three recent tests resulted in one battery pack catching fire and one smoking and emitting sparks.
The National Highway Traffic Safety Administration replicated side impact tests on three Volts on Nov. 16, 17 and 18. The tests were similar to one NHTSA conducted last May in Wisconsin. In that incident, the Volt's batteries caught fire three weeks after the crash test. No one had drained the battery pack after the crash test.
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