P0456 on Your 2022 Grand Wagoneer: Premium Investigation
Your 2022 Grand Wagoneer (WS—first year of the revival) has triggered P0456—a very small EVAP leak. The 6.4L HEMI V8 uses a Stellantis EVAP system with NVLD. Despite the premium price, the EVAP system is standard Stellantis architecture. Warranty runs through 2025—check mileage.
Evidence
- Check engine light on
- P0456 stored
- No performance issues—all 471 horsepower unaffected
- Gas cap may need reseating
Suspects
- Gas Cap Seal (High Likelihood): Loose or debris. $0 warranty or $10–$20.
- NVLD Sensor (High Likelihood): First-year platform component. $0 warranty or $150–$320.
- Purge Solenoid Valve (Medium Likelihood): HEMI heat cycling. $0 warranty or $130–$280.
- EVAP Hose (Medium Likelihood): V8 engine bay heat. $150–$300.
- Charcoal Canister (Low Likelihood): Large fuel tank overfilling. $250–$450.
Diagnostic Steps
- Reseat gas cap
- Check warranty—3yr/36k through 2025
- Dealer appointment—wiTech diagnostics
- First-year model—ask about TSBs
Costs
- Under warranty: $0
- Gas cap: $10–$20
- NVLD sensor: $150–$320
- Purge valve: $130–$280
Can I Drive?
Yes. P0456 has zero impact on the 6.4L HEMI, 4x4, air suspension, towing, or luxury features.
Warranty
Stellantis 3yr/36k through 2025—check mileage. 5yr/60k powertrain. Federal emissions 8yr/80k through 2030. First-year model—ask about TSBs.