Tracking P0456 on Your 2021 Palisade
Your 2021 Palisade (LX2) has flagged P0456—a very small EVAP leak. The flagship 3-row SUV's 3.8L V6 uses a standard EVAP system with threaded gas cap. Well within Hyundai's 5yr/60k warranty.
Clues
- Check engine light on
- P0456 stored
- No performance issues
- AWD and all luxury features normal
Causes
- Gas Cap Seal (High Likelihood): Loose or worn. $0 warranty.
- Purge Control Solenoid Valve (High Likelihood): V6 heat. $0 warranty.
- Canister Close Valve (Medium Likelihood): Vent control. $0 warranty.
- EVAP Hose (Medium Likelihood): Connection. $0 warranty.
- FTP Sensor (Low Likelihood): Sensitivity. $0 warranty.
What to Do
- Reseat gas cap
- Warranty appointment—Hyundai 5yr/60k through 2026
- Free diagnosis and repair
Cost
- Under warranty: $0
- 5yr/60k through 2026
- Federal emissions through 2029
Can I Drive?
Yes. P0456 has zero impact on the Palisade's V6, AWD, towing (5,000 lbs), or any feature.
Warranty
Hyundai's 5yr/60k through 2026. 10yr/100k powertrain. Federal emissions 8yr/80k through 2029.