P0456 on the All-New 2024 Infiniti QX80
A P0456 code on your 2024 Infiniti QX80—completely redesigned with a new 3.5L twin-turbo V6 replacing the previous 5.6L V8—indicates the ECM has detected a very small leak (0.020-inch equivalent) in the EVAP system. As a first-year redesign on a new platform, early EVAP codes are typically minor and fully covered by Infiniti's generous warranty.
Likely Causes
- Gas cap not fully seated (30%) — The simplest cause on any vehicle.
- Software calibration sensitivity (25%) — First-year redesigns commonly need calibration refinements.
- Factory EVAP connection variance (20%) — New platform assembly may have fittings not fully engaged.
- Purge or vent valve irregularity (13%) — A marginally out-of-spec component.
- New seal break-in (7%) — Fresh seals needing thermal cycling.
- Transport artifact (5%) — Connection disturbed during delivery.
What to Do
- Check the gas cap — Remove, inspect, reinstall firmly.
- Infiniti dealer visit — Full warranty, zero cost. CONSULT diagnostics and TSB check.
- 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–$35
Warranty
Your 2024 QX80 carries Infiniti's 4-year/60,000-mile basic warranty through 2028 and federal emissions coverage for 8 years/80,000 miles through 2032. No reason to pay out of pocket.