2000 Nissan Pickup fault code

P044 code on 2000 frontier 4cyl with 110,000 miles. what is most likely cause???

PO44 engine code:

The engine control module (ECM) has detected a leak in the fuel tank vapor system or a vapor pressure sensor has malfunctioned.

This indicates is that the EVAP system will not create a significant vacuum when it performs its leak test, as monitored by the Fuel Tank Pressure Sensor.


Could be as simple as a loose or bad gas cap, at 18 years old that’s where I’d start

That’s not a valid code. You are missing a digit.

You are right @NYBo.

Even I left off the last digit. Must be catching!!!


Is the code actually p0440 OP?