Decoding P0455 on Your 2023 Jeep Gladiator
A P0455 on your 2023 Gladiator signals a large EVAP leak. Your 3.6L Pentastar V6 pickup is likely under warranty. The gas cap is the first clue—especially if you use the Gladiator off-road.
Evidence
- Check engine light on
- P0455 stored in PCM
- Possible fuel smell
- Gas cap issue
Top Causes
- Gas Cap Seal (Very High Likelihood): Trail contamination or defect. Warranty-covered.
- EVAP Canister Vent Valve (Medium Likelihood): Stellantis vent valve. Warranty-covered.
- Purge Solenoid (Medium Likelihood): Stuck open. Warranty-covered.
- Vapor Line (Low Likelihood): Trail damage. Warranty-covered.
- Charcoal Canister (Low Likelihood): Water intrusion. Warranty-covered (if not abuse).
What to Do
Clean and tighten the gas cap. Drive 2–3 days. If P0455 returns, visit your Jeep dealer for warranty repair.
Warranty
Your 2023 Gladiator is under Stellantis's 3-year/36,000-mile warranty through 2026. Federal emissions warranty (8yr/80k) covers EVAP through 2031.
Safe to Drive?
Yes. P0455 is vapor only. The V6, 4WD, towing, and all truck features work normally.