Investigating P0446 on Your 2022 Acura RDX
A P0446 code on your 2022 Acura RDX indicates an EVAP vent control circuit malfunction. The third-generation RDX uses a 2.0L turbocharged four-cylinder with a 10-speed automatic. Acura's EVAP system features a canister vent shut valve and bypass solenoid valve, 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
- Possible fuel odor
Top Suspects
- Canister Vent Shut Valve Failure (High Likelihood): The vent shut valve is the primary P0446 component on Honda/Acura. Replacement costs $130–$240 if not warranty-covered.
- Bypass Solenoid Valve Malfunction (High Likelihood): The purge valve sticks, disrupting EVAP flow. Replacement runs $120–$210.
- Vent Valve Wiring or Connector (Medium Likelihood): Connector corrosion or damage. Repair costs $80–$170.
- EVAP Hose Connection (Medium Likelihood): Turbo engine heat can accelerate hose deterioration. Repair runs $50–$130.
- Gas Cap Seal (Low Likelihood): The #1 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—it's the most common EVAP cause on Honda/Acura vehicles. Then scan for all codes and inspect the vent valve connector.
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 is an emissions circuit code that doesn't affect your RDX's turbo performance, SH-AWD, transmission, or safety features.