Following the Evidence: P0446 on Your 2019 Hyundai Tucson
Your 2019 Hyundai Tucson has presented a P0446 code — a clue pointing to an EVAP vent control circuit malfunction. This third-generation Tucson (TL platform) with the 2.0L or 2.4L engine uses a Canister Close Valve (CCV) to manage the evaporative emissions system. After six years of service, electrical wear in this circuit is a common finding.
The TL Tucson uses a straightforward EVAP design. P0446 means the CCV circuit has an electrical fault — not a vapor leak — so the investigation focuses on solenoids, wiring, and connectors rather than hoses and seals.
Symptoms You May Have Noticed
- Check engine light on with P0446 stored
- Fuel nozzle repeatedly clicking off during fill-ups
- Faint fuel odor near the rear of the SUV
- EVAP readiness monitor not setting
- Possible companion codes like P0441 or P0455
Top Suspects
- Canister Close Valve (CCV) Failure (High Likelihood): Six years of thermal cycling and vibration wear down the CCV solenoid. On the TL Tucson, it's mounted near the charcoal canister at the rear and is the leading P0446 cause. Parts $45–$90, labor $80–$180.
- Wiring and Connector Degradation (High Likelihood): Road salt, moisture, and heat degrade the CCV connector and wiring over time. Corroded terminals are a frequent finding on 2019 models in northern climates. Repair costs $80–$260.
- Fuel Tank Pressure Sensor (FTPS) Drift (Medium Likelihood): The FTPS can lose accuracy over time, providing bad data that affects vent circuit evaluation. Sensor replacement runs $85–$220.
- Charcoal Canister Degradation (Medium Likelihood): The canister's activated charcoal breaks down over years of use, especially if fuel overfilling has occurred. Canister replacement costs $140–$310.
- Ground Circuit Corrosion (Low Likelihood): A corroded ground connection in the vent circuit can create intermittent P0446 codes. Cleaning and repairing the ground costs $50–$150.
Diagnostic Approach
- Confirm P0446 and check for companion codes with an OBD-II scanner
- Inspect the CCV connector under the vehicle — look for corrosion and water damage
- Test CCV resistance with a multimeter against Hyundai specifications
- Command the CCV with direct 12V — confirm it clicks open and closed
- Trace wiring from the CCV to the PCM, checking for abrasion or breaks
- Test FTPS and check charcoal canister if CCV circuit is healthy
Cost Estimates
- CCV replacement: $125–$270
- Wiring/connector repair: $80–$260
- FTPS replacement: $85–$220
- Charcoal canister: $140–$310
- Diagnostic fee: $75–$130
Can I Drive With P0446?
Yes. P0446 is an emissions circuit code with no effect on engine performance, transmission, or AWD operation. Your Tucson drives normally — the only issue is emissions compliance.
DIY vs. Professional
Your 2019 Tucson is likely past Hyundai's 5-year/60,000-mile basic warranty, but check the federal emissions warranty — EVAP components are covered for 8 years/80,000 miles, which means your 2019 model may still qualify through 2027. For DIY, the CCV is moderately accessible and the replacement is a manageable project with basic tools.