P0440 on Your 2023 Nissan Murano: The Investigation
Your 2023 Nissan Murano — the final year of the third generation — has set a P0440 code. The 3.5L VQ35DD V6 and Xtronic CVT power a familiar EVAP system. With potential warranty coverage still available, resolution should be straightforward.
Symptoms
- Check engine light on
- Possible fuel odor
- Slight MPG decrease
- Fueling difficulties
- Emissions failure
Your Murano performs normally. All comfort and safety features function as designed.
Causes
- Gas Cap — First check. Estimated repair: $5–$25.
- Purge Volume Control Valve — VQ35 known failure. Estimated repair: $80–$210.
- Canister Vent Control Valve — Common Nissan failure. Estimated repair: $90–$225.
- Leak Detection Pump — Self-test pump. Estimated repair: $150–$355.
- EVAP Line Leak — Minor vapor line leak. Estimated repair: $45–$140.
Diagnosis
- Check gas cap
- Full EVAP scan
- Component testing
- Smoke test if needed
Costs
- Gas cap: $5–$25
- PVCV: $80–$210
- Vent control valve: $90–$225
- Leak detection pump: $150–$355
- EVAP line: $45–$140
- Diagnostic: $80–$150
Warranty: Check your mileage. If under 36,000 miles, Nissan's warranty covers the repair at no cost.
Driving Impact
None. Completely safe.
Repair Strategy
Check warranty first. If covered, visit the dealer. If expired, start with the gas cap and work through diagnosis.