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The GM 12580426 is a port fuel injector used in many General Motors vehicles. It is commonly classified as a high-impedance, EV6-style injector with a nominal resistance of approximately 12 ohms. Typical fuel system operating pressure is around 43.5 psi for returnless systems, but exact pressure depends on the vehicle application. This injector is often associated with GM 2.4L and 3.6L engines, though fitment must be verified with the vehicle VIN and model year. Aftermarket replacements are available from multiple brands, but OEM and OE-equivalent parts are recommended for reliable fuel delivery. When replacing the injector, use new O-rings and seals, inspect the fuel rail for debris, and confirm the electrical connector and injector resistance match the engine control module requirements. Always relieve fuel pressure before service and follow the manufacturer's safety procedures.