Solving P0446 on Your 2024 Acura MDX
A P0446 code on your 2024 Acura MDX signals an EVAP vent control circuit malfunction. The MDX uses the 3.5L V6 (standard) or 3.0L turbo V6 (Type S). Acura's EVAP system uses a canister vent shut valve for vent control, built on Honda's reliable 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 affecting EVAP flow. 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 MDX to an Acura dealer. HDS diagnostics and all EVAP repairs are free under warranty.
Full Warranty Coverage
Your 2024 MDX 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 MDX's engine, SH-AWD, transmission, towing, or third-row capability.