Investigating P0446 on Your 2022 Lexus IS
A P0446 code on your 2022 Lexus IS indicates an EVAP vent control circuit malfunction. The refreshed IS uses the GA-N platform with either the 2.0L turbo (IS 300 RWD), 3.5L V6 (IS 300 AWD), or 3.5L V6 (IS 350). Lexus uses a canister close valve (CCV) for EVAP vent control on Toyota's proven architecture.
The Lexus basic warranty (4yr/50k) should still be active. The powertrain warranty (6yr/70k) provides additional coverage through 2028.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
Top Suspects
- Canister Close Valve (CCV) Failure (High Likelihood): The CCV is the primary P0446 component. Replacement costs $140–$260 if not warranty-covered.
- Purge VSV Malfunction (High Likelihood): Sticking Vacuum Switching Valve disrupts EVAP flow. Replacement runs $120–$220.
- CCV Wiring or Connector (Medium Likelihood): Connector issue at the valve. Repair costs $80–$170.
- EVAP Hose Connection (Medium Likelihood): Loose or cracked connection. Repair runs $50–$120.
- Gas Cap Seal (Low Likelihood): Worn seal on a relatively new vehicle. Replacement is $15–$30.
How to Investigate
Under active warranty, go to a Lexus dealer for Techstream diagnostics. The dealer will check for any TSBs and perform CCV/purge VSV commanded tests for definitive diagnosis.
Warranty and Cost
The basic warranty (4yr/50k) should still be active. The powertrain warranty (6yr/70k) extends through 2028, and the federal emissions warranty (8yr/80k) through 2030. Under warranty, all repairs are free.
Safe to Drive?
Yes. P0446 doesn't affect your IS's engine, sport-tuned handling, F SPORT features, or any driving dynamics.