Investigating P0456 on Your 2022 Carnival
Your 2022 Carnival (1st US generation, KA4—replaced the Sedona) has triggered P0456—a very small EVAP leak. The 3.5L Lambda III V6 uses a standard Hyundai/Kia EVAP system. Well within Kia's 5yr/60k warranty through 2027.
Evidence
- Check engine light on
- P0456 stored
- No performance symptoms
- Gas cap may need reseating
Suspects
- Gas Cap Seal (High Likelihood): Most common trigger. $0 warranty.
- Purge Control Solenoid Valve (High Likelihood): Standard failure. $0 warranty.
- Canister Close Valve (Medium Likelihood): Vent control. $0 warranty.
- EVAP Hose (Medium Likelihood): Under-body routing on MPV platform. $0 warranty.
- FTP Sensor (Low Likelihood): Sensitivity. $0 warranty.
What to Do
- Reseat gas cap firmly
- Dealer appointment—Kia 5yr/60k through 2027
- Free warranty repair
Cost
- Under warranty: $0
- 5yr/60k through 2027
- Federal emissions through 2030
Can I Drive?
Yes. P0456 has zero impact on the V6, sliding doors, power features, or safety systems.
Warranty
Kia's 5yr/60k through 2027. 10yr/100k powertrain. Federal emissions 8yr/80k through 2030. Fully covered.