P0440 on Your 2024 Infiniti QX60: A Quick Investigation
When your 2024 Infiniti QX60 displays a check engine light with a P0440 code, it signals a general malfunction in the evaporative emission control system. On a vehicle this new, this is virtually always a warranty-covered issue with a straightforward resolution at your Infiniti dealer. The 2024 QX60 continues with Nissan's established EVAP architecture, refined for the current model year.
Most Probable Causes on a New QX60
- Gas Cap Not Fully Tightened (30% likelihood) — The 2024 QX60 uses a standard threaded gas cap. After refueling, the cap must click at least once to seal properly. A cap that's cross-threaded or not fully turned is the most common trigger on newer vehicles. Tighten until you hear a click; if the seal is damaged, replace the cap ($12–$30).
- Purge Control Solenoid Valve (25% likelihood) — A factory-defective PCSV that doesn't seal properly during EVAP testing. Located in the engine compartment for easy dealer access. Warranty replacement.
- Canister Close Valve (CCV) (20% likelihood) — A defective vent valve from manufacturing. The CCV at the rear of the vehicle may fail to close during system testing. Warranty replacement.
- Leak Detection Pump (10% likelihood) — Nissan/Infiniti's active leak detection pump can have manufacturing defects that cause false readings or testing failures. Warranty replacement.
- Vapor Line Assembly Issue (5% likelihood) — A connection not fully seated during vehicle assembly. Identified through dealer smoke testing. Warranty repair.
- Fuel Tank Pressure Sensor (5% likelihood) — An out-of-spec sensor triggering false EVAP test failures. Warranty replacement.
- Charcoal Canister (5% likelihood) — Only if the tank has been repeatedly overfilled. Warranty replacement if defective.
What You Should Do
- Remove and reinstall the gas cap, ensuring it clicks securely
- Drive normally for 2–3 days to see if the check engine light clears
- If the light remains, contact your Infiniti dealer for a warranty service appointment
- Do not attempt repairs yourself on a vehicle under warranty
Full Warranty Protection
Your 2024 QX60 is covered by Infiniti's 4-year/60,000-mile basic warranty, which covers all EVAP system components. The federal emissions warranty provides additional coverage on specified emissions parts for 8 years/80,000 miles. All diagnosis, parts, and labor for P0440 repair will be at no cost to you at any authorized Infiniti dealer.
At the Dealer
Infiniti technicians will use CONSULT diagnostic software to read freeze frame data, test solenoid operation, verify leak detection pump function, and monitor fuel tank pressure. A smoke test may be performed to identify physical leaks. Most P0440 repairs on current-model vehicles are completed within 1–3 hours during a single service visit. For the 2024 QX60 specifically, the dealer will also check for any applicable technical service bulletins or software updates that may address EVAP monitoring calibration.