DETROIT (AP) - Federal safety regulators are investigating fires in the driver's side doors of Chevy TrailBlazers, the second such probe in a week.
The latest inquiry involves more than 309,000 TrailBlazer SUVs from the 2006 and 2007 model years.
The fires began in the power window switch or related electrical parts, the National Highway Traffic Safety Administration said Monday.
The agency began investigating the TrailBlazer on Thursday, just three days after it opened a probe into similar problems with the 2007 Toyota Camry sedan and RAV4 SUV. None of the vehicles have been recalled.
The vehicles under investigation are popular. The Trailblazer, although phased out in 2009, was among GM's top-sellers. The Camry was the best-selling car in the U.S. last year.
The agency has received 12 complaints of smoke or fires in TrailBlazers. No injuries have been reported, says the SUVs maker, General Motors Co. None of vehicles that caught on fire were destroyed, although some door parts melted and seats were singed, the automaker says.
Several of the TrailBlazer fires happened while the SUVs were moving. Others occurred when the engines were off and the vehicles were unattended.