OBD codes / P0455 / Nissan Altima
P0455 on a Nissan Altima
Evaporative Emission System Leak Detected (Large Leak)
All modern Altimas with sealed EVAP.
What P0455 usually means on a Altima
P0455 flags a large evaporative-system leak on the Altima. Beyond the gas cap, Nissan's EVAP components - the vent control valve and the purge volume control valve - are frequent offenders, and the vent valve can stick from corrosion. Fuel vapor is escaping rather than being captured. It will not affect driveability but will fail emissions.
Most likely causes on this model
- Loose or worn gas cap
Still the first thing to check on any P0455.
- Stuck EVAP vent control valve
Nissan vent valves corrode and stick, leaving the system unable to seal - a common Altima cause.
- Failed purge volume control valve
A stuck-open purge valve leaks vapor and sets large-leak faults.
- Cracked EVAP hose
Aged lines near the tank and canister split and leak.
What it costs on a Altima
A gas cap is a fifteen-to-thirty-dollar first try. The Nissan vent control valve is a moderate part, often mounted near the charcoal canister at the rear of the car. Purge valve replacement is likewise moderate; a smoke test helps target the right component before buying parts.
Year, engine and mileage change the answer. Get a diagnosis for your Altima — it weighs these causes against your exact configuration and real complaint data.
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Related symptoms
Nissan Altima problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0455 behavior is covered on the main P0455 page. Confirm with a scan tool before buying parts.