EVAP System Vent Valve Circuit Malfunction
2006-2010 Hyundai Sonata 2.4L I4
Description
The PCM has detected a malfunction in the EVAP system canister vent valve circuit. The vent valve controls fresh air flow to the charcoal canister and is essential for EVAP leak detection testing.
Symptoms
- Check Engine Light
- Failed emissions test
- Possible fuel odor
- EVAP monitor will not complete
Common Causes
- Faulty canister vent valve
- Wiring open or short to vent valve
- Corroded vent valve connector
- Blocked vent filter on canister
- PCM driver circuit failure
Diagnostic Steps
- Test vent valve solenoid resistance
- Command vent valve with scan tool and verify operation
- Inspect vent valve wiring and connector
- Check canister vent filter for blockage
- Test PCM output to vent valve
Repair Notes
Replace the canister vent valve if electrically faulty; clean or replace the vent filter if blocked.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1440 on Other Vehicles
Common Questions
What does code P1440 mean on a 2006-2010 Hyundai Sonata?
P1440 stands for "EVAP System Vent Valve Circuit Malfunction". The PCM has detected a malfunction in the EVAP system canister vent valve circuit. The vent valve controls fresh air flow to the charcoal canister and is essential for EVAP leak detection testing.
What are the symptoms of P1440 on a Hyundai Sonata?
Common symptoms of P1440 include: Check Engine Light, Failed emissions test, Possible fuel odor, EVAP monitor will not complete.
What causes P1440 on a 2006-2010 Hyundai Sonata?
Common causes of P1440 include: Faulty canister vent valve, Wiring open or short to vent valve, Corroded vent valve connector, Blocked vent filter on canister, PCM driver circuit failure.