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.
DTC P1441: EVAP System Flow During Non-Purge: Description
DTC tests for undesired intake manifold vacuum flow to Evaporative (EVAP) emission system. Powertrain Control Module (PCM) seals EVAP system by commanding EVAP canister purge valve off and EVAP canister vent valve on. PCM monitors Fuel Tank Pressure (FTP) sensor to determine if a vacuum is being drawn on EVAP system. DTC sets when vacuum in EVAP system is more than a predetermined value within a predetermined time.
For the relationship between the on and off states, and the open or closed states of the EVAP canister purge and vent valves, see EVAP VALVE LOGIC table under DTC P0440: EVAP SYSTEM.
NO RELATED
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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.