Investigating P0456 on Your 2021 Soul
Your 2021 Soul (3rd generation, SK3) has triggered P0456—a very small EVAP leak at the 0.020-inch threshold. The 2.0L MPI four-cylinder uses a standard Hyundai/Kia EVAP system. Kia's 5yr/60k warranty covers through 2026.
Clues
- Check engine light on
- P0456 stored
- No drivability symptoms
- Gas cap may feel loose or worn
Suspects
- Gas Cap Seal (High Likelihood): Most common trigger. $0 warranty or $10–$15.
- Purge Control Solenoid Valve (High Likelihood): Standard failure point. $0 warranty or $80–$190.
- Canister Close Valve (Medium Likelihood): Vent control. $0 warranty or $90–$200.
- EVAP Hose (Medium Likelihood): Connection points. $0 warranty or $100–$220.
- FTP Sensor (Low Likelihood): Sensitivity drift. $0 warranty or $120–$250.
Diagnostic Steps
- Reseat gas cap firmly
- Dealer appointment—Kia 5yr/60k through 2026
- Free diagnosis and repair under warranty
Costs
- Under warranty: $0
- 5yr/60k through 2026
- Federal emissions through 2029
Can I Drive?
Yes. P0456 has zero impact on performance or safety.
Warranty
Kia's 5yr/60k through 2026. 10yr/100k powertrain (EVAP not covered under powertrain). Federal emissions 8yr/80k through 2029.