Solving P0446 on Your 2024 Lexus GX
A P0446 code on your 2024 Lexus GX signals an EVAP vent control circuit malfunction. The all-new third-generation GX 550 features a 3.4L twin-turbocharged V6 on the GA-F body-on-frame platform. Lexus uses a canister close valve (CCV) for EVAP vent control, built on Toyota's proven off-road architecture shared with the Land Cruiser.
Under full warranty, this is a no-cost dealer repair.
Symptoms Present
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
Top Suspects
- Canister Close Valve (CCV) Defect (High Likelihood): Manufacturing variation on the all-new platform. Warranty-covered.
- ECU Software Calibration (High Likelihood): First-year EVAP monitoring calibration update. Warranty-covered reflash.
- Purge VSV Issue (Medium Likelihood): Defective Vacuum Switching Valve. Warranty-covered.
- EVAP Routing Connection (Medium Likelihood): Body-on-frame platform has extensive EVAP routing. Factory connection issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory fit. Warranty-covered.
What to Do
Take your GX to a Lexus dealer. Techstream diagnostics and all EVAP repairs are free under warranty. First-year models may have TSBs for EVAP calibration updates.
Full Warranty Coverage
Your 2024 GX 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 GX's twin-turbo V6 power, transmission, 4WD, off-road capability, towing capacity, or any luxury features.