The NHTSA says its safety investigation over Chevrolet Volts could be lengthy as it probes the...

|By:, SA News Editor

The NHTSA says its safety investigation over Chevrolet Volts could be lengthy as it probes the cause of post-crash fires of the electric vehicles. The company line coming out of Detroit from GM is that it can resolve the issue without a major battery redesign. Shares of GM -1.8% premarket.