GM Chief Executive, Dan Akerson, told the hearing that the Volt got "disproportionate scrutiny" because it became a surrogate for election-year politics and commentary on GM's business and Obama administration policy.
The National Highway Traffic Safety Administration opened an investigation on 25 November 11 into the safety of the Volt's battery pack after its own repeated tests uncovered fire risks. The fires occurred after NHTSA crash tests or other tests where the car's lithium-ion batteries were purposely damaged, and GM has stressed that no "real world" incidents have been reported.
General Motors has sold more than 8,000 Volts, including 1,500 in December 2011, its best month so far. Another 6,500 units have been manufactured. All will undergo retrofits to provide better protection for the battery in event of a crash. GM will also take steps to reduce chances of coolant leaks, which can trigger fires.