Investigating P0446 on Your 2022 Lexus NX
A P0446 code on your 2022 Lexus NX indicates an EVAP vent control circuit malfunction. The second-generation NX (2022+) features the 2.4L turbocharged engine (NX 350), hybrid (NX 350h), or plug-in hybrid (NX 450h+). Built on Toyota's GA-K platform, it uses a canister close valve (CCV) for EVAP vent control.
The Lexus basic warranty (4yr/50k) should still be active. The powertrain warranty (6yr/70k) extends coverage further.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
- Hybrid/PHEV models: monitors may run less frequently
Top Suspects
- Canister Close Valve (CCV) Failure (High Likelihood): The CCV is the primary P0446 component on Toyota/Lexus vehicles. Replacement costs $140–$260 if not warranty-covered.
- Purge VSV Malfunction (High Likelihood): The Vacuum Switching Valve can stick, disrupting EVAP flow on the new turbo platform. Replacement runs $120–$230.
- CCV Connector or Wiring (Medium Likelihood): First-generation redesign—factory assembly issue possible. Repair costs $80–$180.
- EVAP Hose Connection (Medium Likelihood): New platform routing may have a loose factory connection. Repair runs $50–$120.
- Gas Cap Seal (Low Likelihood): Worn seal on a new vehicle. Replacement is $15–$30.
How to Investigate
Under active warranty, go straight to a Lexus dealer for Techstream diagnostics. The 2022 NX is a first-year redesign—check for applicable TSBs. Techstream provides CCV and purge VSV commanded testing for definitive diagnosis.
Warranty and Cost
The Lexus basic warranty (4yr/50k) should still be active for a 2022 model. The powertrain warranty (6yr/70k) extends through 2028. Under warranty, all repairs are free. Out of pocket: $120–$260.
Safe to Drive?
Yes. P0446 is an emissions circuit code that doesn't affect your NX's engine, turbo performance, AWD, hybrid system, or safety features.