P0456 on Your 2024 Lincoln Aviator
A P0456 code on your 2024 Lincoln Aviator signals the PCM has found a very small leak (0.020-inch equivalent) in the EVAP system. Whether you have the standard 3.0L twin-turbo V6 or the Grand Touring plug-in hybrid, the gasoline EVAP system operates the same way. On a new model, this is typically minor and fully warranty-covered.
Likely Causes
- Gas cap not fully seated (33%) — Most common cause. Click firmly.
- Software calibration sensitivity (22%) — PCM calibration updates may adjust EVAP thresholds.
- Factory EVAP connection variance (18%) — A fitting not fully engaged from assembly.
- Purge or vent valve irregularity (14%) — A slightly out-of-spec component.
- New seal break-in (8%) — Fresh seals needing thermal cycling.
- Transport artifact (5%) — Connection disturbed during delivery.
What to Do
- Check the gas cap — Remove, inspect, reinstall firmly.
- Lincoln dealer visit — Full warranty, zero cost. FDRS diagnostics and TSB check.
- Software update and repair — Dealer handles everything.
Cost
- Under warranty: $0—covered through 2028 (basic) and 2032 (emissions)
- Gas cap (DIY): $15–$35
Warranty
Your 2024 Aviator carries Lincoln's 4-year/50,000-mile comprehensive warranty through 2028 and federal emissions coverage for 8 years/80,000 miles through 2032. Let the dealer handle it at no cost.