The P0440 Investigation: Your 2020 Nissan Murano
A P0440 code on your 2020 Nissan Murano directs our detective work to the EVAP system. The Murano's 3.5L VQ35DD V6, paired with Nissan's Xtronic CVT, uses a comprehensive EVAP system with Nissan-specific components. After several years, certain failures become more likely.
Symptoms
- Check engine light on
- Faint fuel odor
- Slight MPG decrease
- Fueling difficulties
- Emissions test failure
Your Murano drives, handles, and provides all comfort features normally. P0440 does not affect the V6, CVT, or AWD system.
Causes Ranked
- Gas Cap — Worn seal after years of use. Estimated repair: $5–$25.
- Purge Volume Control Valve — The PVCV on the VQ35DD is a known Nissan failure. Estimated repair: $80–$210.
- Canister Vent Control Valve — Located near the charcoal canister. Estimated repair: $90–$220.
- EVAP Leak Detection Pump — Nissan's self-test pump can degrade. Estimated repair: $150–$355.
- Charcoal Canister — Can be saturated from overfilling. Estimated repair: $200–$490.
Diagnosis
- Gas cap replacement and code clear
- Full EVAP code scan
- Test PVCV and vent valve
- Check leak detection pump
- Smoke test for physical leaks
Costs
- Gas cap: $5–$25
- PVCV: $80–$210
- Vent control valve: $90–$220
- Leak detection pump: $150–$355
- Charcoal canister: $200–$490
- Diagnostic: $80–$150
Safe to Drive?
Yes. No performance, safety, or comfort concerns.
DIY Potential
Gas cap is easy. The purge valve on the VQ35DD is accessible in the engine bay. Rear components require working underneath the vehicle. Moderate difficulty for an experienced DIYer.