AdAge reports that General Motors has launched a newspaper and TV marketing campaign to reinforce the Volt’s image as a safe, innovative car. In November, the National Highway Traffic Safety Administration began an investigation after two incidents in which the Volt’s battery pack either caught fire or emitted sparks following intense crash testing. The NHTSA closed the investigation last week. Congressional Republicans criticized the government’s response, accusing NHTSA of a conflict of interest because the government still owns 26.5 percent of the company’s shares. The GOP released its report at a hearing titled: “Volt Vehicle Fire: What Did NHTSA Know and When Did They Know It?”