P0456 on Your 2024 K5: Warranty Handles It
Your 2024 K5 (the Optima's successor) has triggered P0456—a very small EVAP leak. Whether you have the 1.6L turbo or 2.5L turbo (GT), the EVAP system uses a standard threaded gas cap. Under Kia's generous warranty, zero cost.
Symptoms
- Check engine light on
- P0456 stored
- No performance issues
- All driving modes normal
Causes
- Gas Cap Seal (High Likelihood): Loose cap. $0 warranty.
- Purge Control Solenoid Valve (High Likelihood): Component variance. $0 warranty.
- Canister Close Valve (Medium Likelihood): Vent control. $0 warranty.
- EVAP Connection (Medium Likelihood): Factory assembly. $0 warranty.
- Software Update (Low Likelihood): ECM calibration. $0 warranty.
What to Do
- Reseat gas cap
- Schedule warranty appointment
- Dealer fixes for free
Cost
- Under warranty: $0
- 5yr/60k through 2029
- Federal emissions through 2032
Can I Drive?
Yes. P0456 has zero impact—including on the 290-hp GT turbo.
Warranty
Kia's 5yr/60k through 2029. 10yr/100k powertrain. Federal emissions 8yr/80k through 2032.