P0440 Evaporative emission leak test malfunction
This code is for the Evap system , the main cause to set this code is the FTP (fuel tank pressure) sensor, If you have smoke tested the system and with the smoke test the evap system is sealed, Your next step is to monitor the FTP sensor
On the fuel tank module is the FTP sensor, if this sensor is not reporting the correct fuel tank pressure / vacuum you would set a P0440
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