Solving P0440 on Your 2018 Nissan Altima
Your 2018 Nissan Altima, the final year of the fifth generation, has set a P0440 code. After years of service, the EVAP system components are prime suspects for age-related failures. The 2018 Altima with its 2.5L QR25DE or 3.5L VQ35DE engine has well-documented EVAP issues. Let's investigate.
Symptoms
- Check engine light on
- Fuel odor, especially in warm weather
- Reduced fuel economy
- Fueling difficulties
- Emissions inspection failure
Your Altima drives normally. P0440 has no impact on the engine or CVT transmission.
Common Causes at This Age
- Worn Gas Cap — After 6+ years, the gasket is likely degraded. Estimated repair: $5–$20.
- Purge Volume Control Valve (PVCV) — The most common mechanical EVAP failure on fifth-gen Altimas. Sticking or electrical failure is typical at this mileage. Estimated repair: $70–$185.
- Canister Close Valve — Nissan's canister close valve (similar to a vent valve) is a known failure point on older Altimas. Estimated repair: $80–$200.
- EVAP Leak Detection Pump — The self-test pump degrades with age. Estimated repair: $130–$320.
- Deteriorated EVAP Hoses — Rubber hoses crack after years of heat exposure. Estimated repair: $35–$120.
Diagnosis
- Replace gas cap with OEM part
- Scan for all EVAP codes
- Test PVCV and canister close valve
- Verify leak detection pump operation
- Smoke test and visual inspection of all hoses
Repair Costs
- Gas cap: $5–$20
- PVCV: $70–$185
- Canister close valve: $80–$200
- Leak detection pump: $130–$320
- Hoses: $35–$120
- Diagnostic: $80–$150
Driving Concerns
None. P0440 is safe to drive with indefinitely.
DIY Guide
The 2018 Altima is very DIY-friendly for EVAP work. The PVCV is accessible on the engine, and the gas cap is trivial. The canister close valve and leak detection pump near the fuel tank are moderate DIY jobs. Plenty of fifth-gen Altima repair guides exist online.