What is spn 2853 FMI 9?

SPN 2853 FMI 9 is a diagnostic fault code related to the engine control module (ECM) in heavy-duty vehicles. It indicates a problem with the engine's fuel injection system, specifically regarding the fuel pressure sensor. FMI 9 signifies that the signal is out of range, which may suggest an electrical issue or a malfunctioning sensor. Addressing this code typically involves inspecting the wiring and connections to the fuel pressure sensor or replacing the sensor itself.