Tracking P0446 on Your 2024 Mazda CX-5
A P0446 code on your 2024 Mazda CX-5 signals an EVAP vent control circuit malfunction. The CX-5 uses Mazda's Skyactiv-G 2.5L naturally aspirated engine (or available 2.5L turbo) with a canister vent shut valve for EVAP management. The PCM has detected a circuit fault in this valve.
Under full Mazda warranty, this is a dealer repair at no cost. Mazda's Skyactiv EVAP system is known for its reliability, making P0446 relatively uncommon on these vehicles.
Symptoms Detected
- Check engine light on with P0446
- Fuel fill difficulties — nozzle clicking off
- EVAP readiness monitor incomplete
- Possible companion codes
Likely Causes
- Canister Vent Shut Valve Defect (High Likelihood): Manufacturing variation in the vent valve. Even reliable Skyactiv systems can have individual component defects. Warranty-covered.
- PCM Software Calibration (High Likelihood): EVAP monitoring calibration updates may be available. A dealer reflash is a quick fix. Warranty-covered.
- Purge Solenoid Valve Issue (Medium Likelihood): A faulty purge valve affects EVAP system monitoring. Warranty-covered.
- EVAP Circuit Connector (Medium Likelihood): Factory connector seating issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory cap fit issue. Warranty-covered.
What to Do
Schedule a Mazda dealer appointment. Under warranty, Mazda IDS diagnostics and all EVAP repairs are free. Mazda's straightforward EVAP design makes diagnosis efficient.
Full Warranty
Your 2024 CX-5 is covered by Mazda's 3-year/36,000-mile basic warranty, 5-year/60,000-mile powertrain warranty, and the federal emissions warranty (8 years/80,000 miles). All EVAP repairs are free.
Safe to Drive?
Yes. P0446 doesn't affect your CX-5's Skyactiv engine, 6-speed automatic, i-ACTIV AWD (if equipped), or any driving system.