Solving P0446 on Your 2024 Acura TLX
A P0446 code on your 2024 Acura TLX signals an EVAP vent control circuit malfunction. The TLX is available with the 2.0L turbocharged four-cylinder or 3.0L twin-turbo V6 (Type S). Acura uses a canister vent shut valve for EVAP vent control, built on Honda's proven architecture.
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 Vent Shut Valve Defect (High Likelihood): Manufacturing variation. Warranty-covered.
- ECU Software Calibration (High Likelihood): EVAP monitoring update. Warranty-covered reflash.
- Bypass Solenoid Valve Issue (Medium Likelihood): Defective purge valve. Warranty-covered.
- Vent Valve Wiring or Connector (Medium Likelihood): Factory assembly issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory fit. Warranty-covered.
What to Do
Take your TLX to an Acura dealer. HDS diagnostics and all EVAP repairs are free under warranty.
Full Warranty Coverage
Your 2024 TLX is covered by Acura's 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 TLX's engine, turbo performance, SH-AWD, or any sport-driving dynamics. Type S capability is fully maintained.