Solving P0446 on Your 2024 Lexus NX
A P0446 code on your 2024 Lexus NX signals an EVAP vent control circuit malfunction. The NX is available with the 2.4L turbo (NX 350), hybrid (NX 350h), or plug-in hybrid (NX 450h+), all built on Toyota's GA-K platform. Lexus uses a canister close valve (CCV) for EVAP vent control—a proven Toyota-engineered design.
Under full warranty, this is a no-cost dealer repair.
Symptoms Present
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
- PHEV models: monitors may run less frequently
Top Suspects
- Canister Close Valve (CCV) Defect (High Likelihood): Manufacturing variation in the CCV. Warranty-covered.
- ECU Software Calibration (High Likelihood): EVAP monitoring update. Warranty-covered reflash.
- Purge VSV Issue (Medium Likelihood): Defective Vacuum Switching Valve affecting EVAP flow. Warranty-covered.
- CCV Wiring or Connector (Medium Likelihood): Factory assembly issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory fit. Warranty-covered.
What to Do
Take your NX to a Lexus dealer. Techstream diagnostics and all EVAP repairs are free under warranty.
Full Warranty Coverage
Your 2024 NX is covered by Lexus' 4-year/50,000-mile basic and 6-year/70,000-mile powertrain warranty. All EVAP repairs are free.
Safe to Drive?
Yes. P0446 doesn't affect your NX's engine, turbo performance, AWD, hybrid/PHEV operation, or safety systems.