P0456 on Your 2019 Tucson: The Micro-Leak Hunt
Your 2019 Tucson (3rd generation, TL, refreshed) has triggered P0456—a very small EVAP leak at 0.020 inches. The 2.0L or 2.4L four-cylinder uses a standard EVAP system. Still within Hyundai's 5yr/60k warranty through 2024—check your mileage.
Evidence
- Check engine light on
- P0456 stored
- No performance symptoms
- Gas cap may show wear after 6+ years
Suspects
- Gas Cap Seal (High Likelihood): Six years of wear. $10–$15.
- Purge Control Solenoid Valve (High Likelihood): Age-related. $80–$190.
- Canister Close Valve (Medium Likelihood): Vent valve aging. $90–$200.
- EVAP Hose Micro-Crack (Medium Likelihood): Rubber deterioration. $100–$220.
- Charcoal Canister (Low Likelihood): Fuel overfilling. $180–$350.
Diagnostic Steps
- Replace gas cap ($10–$15)
- Clear code and drive 50+ miles
- Check if still under 5yr/60k warranty (expired 2024 by time, check mileage)
- Federal emissions warranty covers through 2027
- Smoke test for persistent leaks
Costs
- Gas cap: $10–$15
- Purge valve: $80–$190
- Canister close valve: $90–$200
- EVAP hose: $100–$220
Can I Drive?
Yes. P0456 has zero safety or performance impact.
Warranty
Hyundai's 5yr/60k expired in 2024. Federal emissions (8yr/80k) covers EVAP through 2027. Check mileage—if under 80k, you may get free repairs.