Investigating P0446 on Your 2022 Acura TLX
A P0446 code on your 2022 Acura TLX indicates an EVAP vent control circuit malfunction. The second-generation TLX uses a 2.0L turbo four-cylinder (standard) or the 3.0L twin-turbo V6 (Type S). Acura's EVAP system features a canister vent shut valve for vent control, built on Honda's reliable architecture.
The Acura basic warranty (4yr/50k) should still be active. The powertrain warranty (6yr/70k) provides coverage through 2028.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
Top Suspects
- Canister Vent Shut Valve Failure (High Likelihood): The primary P0446 component on Honda/Acura. Replacement costs $130–$240 if not warranty-covered.
- Bypass Solenoid Valve Malfunction (High Likelihood): Sticking purge valve disrupts EVAP flow. Replacement runs $120–$220.
- Vent Valve Wiring or Connector (Medium Likelihood): Connector corrosion or damage. Repair costs $80–$170.
- EVAP Hose Connection (Medium Likelihood): Loose or deteriorated hose. Repair runs $50–$130.
- Gas Cap Seal (Low Likelihood): The most common EVAP trigger on Honda/Acura. Replacement is $12–$28.
How to Investigate
Under active warranty, go to an Acura dealer for HDS diagnostics. For DIY, try the gas cap first. HDS provides canister vent shut valve and bypass solenoid commanded testing for definitive diagnosis.
Warranty and Cost
The basic warranty (4yr/50k) should be active. The powertrain warranty (6yr/70k) covers 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 TLX's engine, turbo performance, SH-AWD, or sport-tuned driving dynamics. Type S capability is fully maintained.