Investigating P0442 on Your 2022 Nissan Maxima
A P0442 code on your 2022 Nissan Maxima means the engine control module has found a small leak in the evaporative emission control system. This system captures fuel vapors from the gas tank, stores them in a charcoal canister, and routes them to the engine for combustion. P0442 flags a leak roughly the size of a 0.020-inch opening.
The 2022 Maxima is the final model year for Nissan's flagship sedan, powered by the 3.5L VQ35DE V6 with 300 horsepower. As the last Maxima ever produced, the EVAP system design is fully mature. Nissan's architecture includes the PVCV, canister vent control valve, and dedicated leak detection pump.
Probable Causes
- Gas Cap Seal Issue — After a couple years of use, the gas cap O-ring can develop minor wear or be improperly seated. Check this first — it is the most common and cheapest cause.
- PVCV (Purge Volume Control Valve) Problem — The V6's underhood heat stresses the PVCV over time. A valve that does not seal properly allows vapor escape during testing.
- Canister Vent Control Valve Issue — Road debris and moisture can affect the vent valve's sealing ability, even on a relatively new vehicle.
- Vapor Line Looseness — Quick-connect fittings on the vapor lines can develop slight looseness from normal vibration.
- Leak Detection Pump Concern — Nissan's dedicated pump could have early wear or a calibration issue.
What to Do
- Check the gas cap — Remove, inspect, and reinstall firmly. A new cap costs $10–$20.
- Check warranty — Your 2022 Maxima may still be within the 3-year/36,000-mile basic warranty. EVAP components are covered for 8 years or 80,000 miles under the federal emissions warranty.
- Smoke test — If the gas cap does not resolve it, a smoke test ($80–$150) pinpoints the leak location.
- Nissan CONSULT diagnosis — The dealer's CONSULT system performs active testing of all EVAP components.
Costs and Warranty
Repair costs if out of warranty: gas cap $10–$20, PVCV $140–$280, vent valve $110–$250, leak detection pump $200–$400. As the final Maxima model year, parts remain readily available. Check warranty status with your Nissan dealer first.