Tracking Down P0455 on Your 2022 Nissan Altima
A P0455 on your 2022 Altima means the ECM found a large EVAP leak. Your 6th-generation Altima with the 2.5L engine and CVT may still be within Nissan's basic warranty. The gas cap is the most frequent cause—check it first.
Clues to Examine
- Check engine light with P0455
- Possible fuel odor near the rear
- Gas cap not clicking when tightened
- Emissions test failure
Suspects Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. Tighten or replace ($10–$25).
- Vent Control Valve (Medium Likelihood): Nissan's vent valve sticking open. $120–$220 if out of warranty.
- Purge Volume Control Valve (Medium Likelihood): Nissan's PVCV stuck open. $100–$200.
- Vapor Line (Low Likelihood): Cracked or disconnected hose. $80–$200.
- Charcoal Canister (Low Likelihood): Saturated from fuel overfilling. $200–$350.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, check warranty status and visit a Nissan dealer. CONSULT diagnostics and smoke testing will locate the leak.
Warranty Coverage
Nissan's basic warranty (3yr/36k) runs through 2025. The federal emissions warranty (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect the Altima's 2.5L engine, CVT, or any driving systems.