What P0442 Means for Your 2019 Hyundai Tucson
The P0442 code on your 2019 Hyundai Tucson indicates the engine control module has detected a small leak in the evaporative emission control system. This system prevents fuel vapors from escaping the gas tank by capturing them in a charcoal canister and routing them to the engine. A leak roughly 0.020 inches in diameter was found during the automated test.
The 2019 Tucson is part of the third generation, available with a 2.0L or 2.4L four-cylinder engine. After five-plus years of service, age-related wear on EVAP components is a primary concern. Hyundai's system uses the PCSV, CCV, and FTPS.
Most Likely Causes
- Gas Cap O-Ring Wear — After five-plus years, the gas cap seal is a top suspect. A new cap costs $10–$20.
- PCSV Degradation — Years of engine heat cycling degrade the Purge Control Solenoid Valve's sealing surfaces.
- CCV Failure — The Canister Close Valve can fail from years of moisture and debris exposure.
- Vapor Line Aging — Rubber hoses become brittle and develop hairline cracks.
- FTPS Sensor Drift — Age-related drift in the Fuel Tank Pressure Sensor readings.
Diagnostic Steps
- Replace the gas cap — Cheapest first step. Clear the code and drive for several days.
- Check Hyundai warranty — Your 2019 Tucson may still be within Hyundai's 5-year/60,000-mile basic warranty depending on mileage. EVAP components are covered for 8 years or 80,000 miles.
- Smoke test — Professional smoke test ($80–$150) if needed.
Costs
Gas cap $10–$20, PCSV $120–$250, CCV $90–$220, FTPS $80–$190. Check warranty status first — Hyundai's generous 5-year coverage may still apply.