BMW said it first discovered the issue in 2007 and changed the pin coating from tin to silver on the production line starting in May 2011.

The pins connecting various wires could corrode, which could cause a short and melt the wiring, especially if the driver switches the fan speed to its highest setting. Dealers will replace the blow-by heater starting in December.Īnother 672,775 cars have potentially faulty wiring harnesses that control the heating, ventilation, and air conditioning fan speed. Drivers may first notice smoke within the engine compartment or a burning plastic smell. Manufacturing “irregularities” could allow moisture to collect near the blow-by heater’s electrical contacts and cause a short circuit, according to filings. The problem is most prevalent in vehicles between two and eight years old, the company said. The recall includes all variants: rear- and all-wheel-drive powertrains in coupe, convertible, and station-wagon models. BMW did not specify how many fires have occurred but said that the “heat-related damage” was primarily “localized and self-extinguishing.” No injuries or accidents were reported, the company said.

BMW said it first discovered the issue on a single 2007 X5 in 2009 and began collecting damaged blow-by heaters in 20 but did not issue a recall. Also known as a blow-by heater, it prevents ice from forming when treating the hot, combusted gas venting from the crankcase. At issue on 740,561 cars is a positive crankcase ventilation valve heater that can short, melt, and ignite. The automaker filed two separate recalls that cover cars from the 2006 through 2011 model years.

for electrical fires, according to filings with the National Highway Traffic Safety Administration (NHTSA). BMW is recalling 1 million cars in the U.S.

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