P0442 on Your 2021 Hyundai Palisade
The P0442 code on your 2021 Hyundai Palisade indicates the engine control module has detected a small leak in the evaporative emission control system. This system captures fuel vapors from the gas tank and recycles them through the engine. P0442 flags a leak roughly 0.020 inches in diameter.
The 2021 Palisade is Hyundai's flagship three-row SUV, powered by a 3.8L V6 engine with an 8-speed automatic transmission. As a larger SUV, the Palisade has more extensive EVAP vapor line routing than smaller Hyundai models. The system uses the PCSV, CCV, and FTPS.
Most Likely Causes
- Gas Cap Seal Wear — After a few years of family SUV use with frequent fill-ups, the gas cap O-ring can wear. A new cap is $10–$20.
- PCSV (Purge Control Solenoid Valve) Issue — The 3.8L V6 generates substantial heat that stresses the PCSV. After a few years, it may begin to leak during sealed-system tests.
- CCV (Canister Close Valve) Problem — Moisture and road debris can affect the CCV's sealing ability.
- Vapor Line Connection Issue — The Palisade's larger size means longer vapor line runs with more connections. Any loose fitting creates a potential leak.
- FTPS Drift — Minor Fuel Tank Pressure Sensor calibration drift.
Warranty Coverage
- Check the gas cap — Free first step. Remove, inspect, reinstall firmly.
- Visit your Hyundai dealer — Your 2021 Palisade is within Hyundai's 5-year/60,000-mile basic warranty (through approximately 2026). EVAP components are covered for 8 years or 80,000 miles. All repairs at no cost.
- GDS diagnosis — The dealer's GDS system provides comprehensive EVAP testing.
Costs if Out of Warranty
Gas cap $10–$20, PCSV $140–$280, CCV $110–$250, FTPS $90–$210.