Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
P0440-General EVAP System Failure: Notes
- When Monitored : Engine Running. Cold start test. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs when small leak test is maturing.
- Set Condition : The PCM activates the EVAP Purge Solenoid to pull the EVAP system into a vacuum. The PCM turns the EVAP Purge solenoid off to seal the EVAP system. If the Fuel Tank Pressure Sensor reads between -1.5 to +1.0 hPa before the calibrated amount of time for a Medium leak/Small leak an error is detected. Two Trip Fault.
| Possible Causes |
|---|
| EVAPORATIVE EMISSION SYSTEM LEAK |
| FUEL TANK PRESSURE SENSOR |
For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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