Bigger bust: Obama or the official car of his administration?

Washington — General Motors plug-in electric Chevrolet Volt had its worst sales month since August, as negative publicity over fire risks hurt vehicles sales in January.

GM sold just 603 Volts — above its sales in January 2011, but far below GM’s best-ever sales month in December, when GM sold 1,529 Volts.

Last week, GM North America President Mark Reuss said sales of the Volt have been hurt by bad publicity.

Reuss said bad publicity from the government’s investigation into fire risks of post-crash Volts is “definitely a component” of the decline in sales.

GM sold about 7,700 in 2011, below GM’s target of 10,000. GM abandoned its sales target of 45,000 for 2012 last month, saying it would match “supply to demand.”

Reuss said that when GM restarts production in February at its Detroit-Hamtramck Assembly plant, it will build Volts in a “very reasonable” volume. He said there is some pent-up export demand.

Reuss says Volt awareness has gone up over the last two months in the wake of publicity over the government’s investigation.

GM is focused on rehabilitating the Volt’s reputation. “It’s a tough road, but we’ve got to do it,” Reuss said.