Investigating P0455 on Your 2024 Nissan Altima
A P0455 on your 2024 Altima means the ECM detected a large EVAP leak. Your 6th-generation Altima with the 2.5L engine is fully under Nissan's warranty. The gas cap is the most common cause—check it before scheduling a dealer visit.
Symptoms
- Check engine light with P0455
- Possible faint fuel odor
- Gas cap not clicking securely
- EVAP readiness monitor not completing
Most Likely Causes
- Gas Cap (Very High Likelihood): Loose or not seated. Tighten until it clicks firmly.
- Software Calibration (Medium Likelihood): Nissan may have a TSB for EVAP sensitivity.
- Vent Control Valve (Medium Likelihood): Nissan's vent valve not sealing. Warranty replacement.
- Purge Volume Control Valve (Low Likelihood): Nissan's PVCV stuck open. Warranty-covered.
- EVAP Line Connection (Low Likelihood): Assembly issue. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, visit a Nissan dealer. CONSULT diagnostics and smoke testing are free under warranty.
Warranty Coverage
Your 2024 Altima is covered by Nissan's 3-year/36,000-mile basic warranty through 2027 and the federal emissions warranty (8yr/80k) through 2032. All EVAP repairs are free.
Safe to Drive?
Yes. P0455 doesn't affect the Altima's 2.5L engine, CVT, or any features.