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 P1443: EVAP System Vent Control Function Problem
- Turn ignition off. Connect scan tool to DLC. Retrieve DTCs. If any DTCs other than P1443 exist, repair those DTCs first. If DTC P1443 is only DTC set, check the following:
- Blockage Of Air Filter
- Blockage Of Junction Pipe
- Blockage Of Vent Hoses Between Air Filter And Junction Pipe
- Blockage Of Vent Hose Between Drain Valve And Air Filter
- Blockage Of Vent Hoses Between Canister And Drain Valve
See Fig 1 and Fig 2 . Repair as necessary. If no problem was found, go to next step.
- Turn ignition off. Connect test mode connector. See Figure and Figure . Connect scan tool to DLC. Turn ignition on. Using scan tool, select "COMPULSORY VALVE OPERATION CHECK" mode. Activate drain valve with scan tool and listen for clicking sound from valve. If clicking sound was heard, manufacturer recommends contacting factory service personnel because probable cause is deterioration of multiple parts. Check for intermittent connections. If no clicking was heard, replace drain valve.
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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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