Subaru will be contacting the owners of certain 2017 Impreza vehicles regarding a problem affecting the fuel system. Due to a software programming issue within the engine control unit, the operating threshold of the radiator fan used to cool the fuel temperature is not set low enough for winter blend fuels. A combination of winter fuel, warm temperatures and low speed or stopped driving conditions may cause the fuel to vaporize prematurely. Premature vaporization causes a decrease in fuel pressure, rough idling, a no start condition or an engine stall. In some cases, if the engine were to stall, the driver may be unable to restart the vehicle for a certain period of time.
Dealers will correct the problem by reprogramming the engine control unit to turn the radiator cooling fan on at a lower temperature. Owners wanting more information about the recall can contact Subaru customer service at 1-800-782-2738. Subaru’s number for this recall is WTP-75 and the NHTSA campaign number is 17V-216.