P0456 on Your 2024 Infiniti Q50
A P0456 code on your 2024 Infiniti Q50 signals the ECM has found a very small leak (0.020-inch equivalent) in the EVAP system. Your Q50 with the 3.0L twin-turbo V6 uses Nissan/Infiniti's EVAP monitoring. On a relatively new model, this is typically minor and warranty-covered.
Likely Causes
- Gas cap not fully seated (35%) — Most common. Click firmly.
- Software calibration sensitivity (22%) — ECM updates may adjust thresholds.
- Factory EVAP connection variance (18%) — A fitting not fully engaged.
- Purge or vent valve irregularity (13%) — A marginally out-of-spec component.
- New seal break-in (7%) — Fresh seals needing cycling.
- Heat-related hose issue (5%) — The twin-turbo engine's heat may affect nearby EVAP lines.
What to Do
- Check the gas cap — Remove, inspect, reinstall.
- Infiniti dealer visit — Full warranty, zero cost.
- Software update and repair — Dealer handles everything.
Cost
- Under warranty: $0—covered under 4-year/60,000-mile warranty through 2028
- Gas cap (DIY): $15–$30
Warranty
Your 2024 Q50 carries Infiniti's 4-year/60,000-mile basic warranty through 2028 and federal emissions coverage for 8 years/80,000 miles through 2032. Take it to the dealer at no cost.