P0456 on Your 2024 Mitsubishi Outlander
A P0456 code on your 2024 Mitsubishi Outlander signals the ECM has found a very small leak (0.020-inch equivalent) in the EVAP system. On a new Outlander with the 2.5L engine, this is typically minor and covered by Mitsubishi's generous warranty.
Likely Causes
- Gas cap not fully seated (35%) — Click firmly.
- Software calibration sensitivity (23%) — Updates may adjust thresholds.
- Factory EVAP connection variance (18%) — A fitting not fully engaged.
- Purge or vent valve irregularity (12%) — Slightly out of spec.
- New seal break-in (7%) — Fresh seals needing cycling.
- Transport artifact (5%) — Connection disturbed.
What to Do
- Check the gas cap — Reinstall firmly.
- Mitsubishi dealer visit — Full warranty, zero cost.
- Software update and repair — Dealer handles everything.
Cost
- Under warranty: $0—covered under 5-year/60,000-mile warranty through 2029
- Gas cap (DIY): $10–$25
Warranty
Your 2024 Outlander carries Mitsubishi's 5-year/60,000-mile warranty through 2029 and federal emissions coverage for 8 years/80,000 miles through 2032.