Federal regulators have expanded an investigation into complaints of engine fires in Jeep Wranglers. According to recent news reports, the government stated that 23 Wrangler owners have complained about fires. The National Highway Traffic Safety Administration (NHTSA) is asking Chrysler to provide information about Wranglers from the years 2007 through 2012. The investigation opened on March 28 and was originally focussed on the 2010 model year. Although the safety agency has not determined the cause of the fires, they suspect the problem is related to overheated transmission fluid and electrical wiring. In one incident, a 2007 Wrangler caught fire in the owner’s driveway and then exploded, setting fire to a nearby house. In another complaint, a 2009 Jeep caught fire in a garage, destroying the vehicle and damaging the house. The owner of a 2008 Wrangler reported that his vehicle became engulfed in flames after he pulled over when he smelled something burning. The NHTSA has given Chrysler until May 22nd to provide information needed to complete the investigation.