P0456 on Your 2023 Gladiator: Investigating
Your 2023 Gladiator (JT) has triggered P0456—a very small EVAP leak. The 3.6L Pentastar V6 uses the same Stellantis EVAP system with NVLD as the Wrangler JL. Well within Stellantis's 3yr/36k warranty through 2026.
Evidence
- Check engine light on
- P0456 stored
- No drivability issues
- May have occurred after off-roading or fueling
Suspects
- Gas Cap Seal (High Likelihood): Loose or trail debris. $0 warranty.
- NVLD Sensor (High Likelihood): Off-road water/mud exposure. $0 warranty.
- Purge Solenoid Valve (Medium Likelihood): Standard failure. $0 warranty.
- EVAP Hose (Low Likelihood): Connection point. $0 warranty.
- Software Calibration (Low Likelihood): Sensitivity threshold. $0 warranty update.
What to Do
- Reseat gas cap—clean filler area
- If recently off-roaded, allow NVLD to dry, clear code
- Dealer appointment if persistent—covered through 2026
Cost
- Under warranty: $0
- 3yr/36k through 2026
- Federal emissions through 2031
Can I Drive?
Yes. P0456 has zero impact on the V6, 4x4, towing, or payload.
Warranty
Stellantis 3yr/36k through 2026. 5yr/60k powertrain. Federal emissions 8yr/80k through 2031.