P0442 on Your 2022 Infiniti QX60: The Case
A P0442 diagnostic trouble code on your 2022 Infiniti QX60 means the engine control module has detected a small leak in the evaporative emission control system. This sealed vapor network captures fuel vapors from the tank and routes them through a charcoal canister back into the engine. The 2022 QX60 is an all-new design on the Pathfinder platform, but it uses a conventional EVAP system that detected a breach of approximately 0.020 inches during its self-diagnostic cycle.
Investigating the Evidence
The redesigned QX60 uses Nissan's EVAP architecture with Infiniti refinements. Here are the ranked suspects:
- Gas cap seal issue (38% of cases) — The most frequent cause across all vehicles. A worn, cracked, or improperly seated gas cap allows enough vapor escape to trigger P0442. After a couple years of use, the seal can show wear.
- Canister vent control valve malfunction (22%) — Infiniti/Nissan's canister vent control valve seals the EVAP system for leak monitoring. Electrical failure or incomplete mechanical closure triggers the small leak detection.
- EVAP line connection issue (18%) — The QX60's three-row SUV layout means extended vapor routing from the tank to the charcoal canister, with multiple connection points that can develop leaks.
- Purge Volume Control Valve (PVCV) failure (12%) — Nissan/Infiniti's PVCV regulates vapor flow from the canister to the engine intake. Internal seal wear or electrical issues can prevent proper sealing.
- Leak detection pump issue (10%) — Nissan's EVAP system uses a dedicated leak detection pump for monitoring system integrity. A faulty pump can produce false readings or fail to maintain test pressure.
Diagnostic Approach
- Gas cap inspection — Check the seal for cracks or wear, clean the filler neck, and reinstall firmly until it clicks. Clear the code and monitor over 2-3 drive cycles.
- Smoke test — The definitive method for locating small EVAP leaks. Essential on the QX60 given its extended vapor routing.
- CONSULT dealer diagnostics — Infiniti's CONSULT diagnostic tool can command the canister vent control valve and PVCV independently, and test the leak detection pump function.
- Leak detection pump test — Unique to Nissan/Infiniti — the technician should verify the leak detection pump is functioning correctly before condemning other components.
Repair Costs
- Gas cap: $15–$35
- Canister vent control valve: $160–$310 installed
- EVAP line repair: $100–$250
- PVCV replacement: $150–$290 installed
- Leak detection pump: $200–$400 installed
- Smoke test: $90–$160
Warranty Information
Your 2022 QX60 is covered by Infiniti's 4-year/60,000-mile basic warranty and 6-year/70,000-mile powertrain warranty. EVAP components are also protected under the federal emissions warranty for 8 years/80,000 miles. Depending on your purchase date, the basic warranty may still apply. Contact your Infiniti dealer to confirm coverage — this repair is very likely covered at no cost.