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P0440 PONTIAC Tech Notes The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code. OBD2 Code P0446 Pontiac definition: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM’s driver controls the ground, and when grounded, activates the valve (closing it). I recently had my fuel pump changed on my 2002 Pontiac Grand Am SE, 2.2 L, 4 speed auto. My "Service Engine Soon" light came on and is the only light on. I went to a part store and had the codes read. The car is reading a C1275, P0440, and P0452 code. Is this linked to my fuel pump being changed, or is something else going on?