Tracking P0456 on Your 2021 Gladiator
Your 2021 Gladiator (JT—Wrangler-based midsize pickup) has triggered P0456—a very small EVAP leak. The 3.6L Pentastar V6 (or 3.0L EcoDiesel) uses the same Stellantis EVAP system with NVLD as the Wrangler JL. Off-road use is a common trigger. Basic warranty (3yr/36k) expired in 2024. Federal emissions (8yr/80k) covers through 2029.
Clues
- Check engine light on
- P0456 stored
- No performance symptoms
- Common after off-roading, towing, or fueling
Suspects
- Gas Cap Seal (High Likelihood): Trail dust and wear. $10–$15.
- NVLD Sensor (High Likelihood): Water/mud from off-road use—same as Wrangler. Under emissions warranty or $120–$280.
- Purge Solenoid Valve (Medium Likelihood): Heat cycling. Under emissions warranty or $100–$240.
- EVAP Hose (Medium Likelihood): Under-bed routing exposure. $120–$260.
- Charcoal Canister (Low Likelihood): Trail water intrusion. $200–$400.
Diagnostic Steps
- Replace gas cap—clean filler area of dust/debris
- Clear code, drive 2–3 cycles
- Check federal emissions warranty—8yr/80k through 2029
- Dealer wiTech diagnostics for NVLD
- Smoke test if needed ($80–$150)
Costs
- Gas cap: $10–$15
- NVLD sensor: $120–$280 (may be emissions covered)
- Purge valve: $100–$240
- Federal emissions 8yr/80k through 2029
Can I Drive?
Yes. P0456 has zero impact on the V6, 4x4, towing, or bed payload.
Warranty
Basic 3yr/36k expired. Powertrain 5yr/60k through 2026. Federal emissions 8yr/80k covers EVAP through 2029.