Investigating P0446 on Your 2022 Infiniti Q50
A P0446 code on your 2022 Infiniti Q50 indicates an EVAP vent control circuit malfunction. The Q50 uses the VR30DDTT 3.0L twin-turbocharged V6 on the FM platform. Infiniti's EVAP system features a canister vent control valve and PVCV (Purge Volume Control Valve) with Nissan's leak detection pump monitoring.
Infiniti's basic warranty (4yr/60k) should still be active. The powertrain warranty (6yr/70k) extends through 2028.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
Top Suspects
- Canister Vent Control Valve Failure (High Likelihood): The vent control valve can fail electrically or mechanically. Replacement costs $130–$250.
- PVCV Malfunction (High Likelihood): The twin-turbo V6 creates significant intake vacuum variations that stress the purge valve. Replacement runs $120–$240.
- Leak Detection Pump (Medium Likelihood): Nissan's EVAP monitoring pump can fail. Replacement costs $150–$300.
- Vent Valve Wiring or Connector (Medium Likelihood): Connector corrosion. Repair costs $80–$180.
- Gas Cap Seal (Low Likelihood): Worn seal. Replacement is $12–$30.
How to Investigate
Under warranty, go to an Infiniti dealer for CONSULT diagnostics. For DIY, scan all codes and check the gas cap first. The Q50's long production run means well-documented repair procedures.
Warranty and Cost
Infiniti's basic warranty (4yr/60k) should be active. The powertrain warranty (6yr/70k) covers through 2028. Under warranty, all repairs are free. Out of pocket: $120–$300.
Safe to Drive?
Yes. P0446 doesn't affect your Q50's twin-turbo V6 performance, RWD/AWD, transmission, or sport-driving dynamics.