Cracking the P0440 Code on Your 2022 Hyundai Elantra
A P0440 code on your 2022 Hyundai Elantra points to an EVAP system malfunction. The Elantra's 2.0L Smartstream engine (147 hp) on the K3 platform uses a standard EVAP system that's generally reliable but not immune to issues. Let's follow the clues to find the cause.
Symptoms
- Check engine light on
- Faint fuel smell near the vehicle
- Slight MPG decrease
- Fueling difficulties at the pump
- Emissions test failure
Your Elantra drives normally. The IVT transmission and engine are unaffected.
Most Likely Causes
- Gas Cap — Worn or loose. Always check first. Estimated repair: $5–$25.
- Purge Control Solenoid Valve — The PCSV can stick or fail electrically on the Smartstream engine. Estimated repair: $70–$185.
- Canister Close Valve — Controls EVAP system airflow. Estimated repair: $80–$205.
- Vapor Line Leak — Hoses can crack from heat cycling. Estimated repair: $45–$140.
- Fuel Tank Pressure Sensor — Can report inaccurate data. Estimated repair: $90–$230.
Diagnostic Steps
- Replace gas cap, clear code, drive 50+ miles
- Scan for all EVAP companion codes
- Test PCSV and CCV with a scan tool
- Smoke test the EVAP system
- Monitor fuel tank pressure sensor readings
Repair Costs
- Gas cap: $5–$25
- PCSV: $70–$185
- CCV: $80–$205
- Vapor line: $45–$140
- FTP sensor: $90–$230
- Diagnostic: $80–$150
Warranty: Check your mileage — Hyundai's 5-year/60,000-mile basic warranty may still cover EVAP repairs.
Can I Drive With P0440?
Yes. No performance or safety concerns. Fix it for emissions compliance.
DIY Feasibility
Gas cap is trivial. The PCSV is accessible in the engine bay on the 2.0L and a moderate DIY job. The CCV near the fuel tank requires more effort.