Tracking P0455 on Your 2018 Jeep Wrangler
P0455 on your 2018 Wrangler JL means a large EVAP leak. As the first year of the JL generation with the 3.6L Pentastar, this Wrangler has had years of exposure. The gas cap is your first lead.
Symptoms
- Check engine light on
- P0455 stored in PCM
- Fuel odor possible
- Gas cap worn or damaged
Causes by Probability
- Gas Cap Seal (Very High Likelihood): 6+ years of wear and off-road exposure. $10–$25.
- EVAP Canister Vent Valve (Medium Likelihood): Age-related failure. $150–$300 installed.
- Purge Solenoid (Medium Likelihood): Worn after years. $140–$280 installed.
- Vapor Lines (Low-Medium Likelihood): Trail damage or age-cracking. $100–$250.
- Charcoal Canister (Low Likelihood): Saturated or damaged. $200–$400 installed.
DIY Approach
Replace the gas cap first—$15 at any parts store. If P0455 returns, check accessible vapor lines under the Wrangler (easy access with stock ride height). For internal EVAP components, a smoke test is recommended.
Warranty
Basic warranty has long expired. The federal emissions warranty (8yr/80k) covers EVAP through 2026—last chance. Check your mileage immediately.
Safe to Drive?
Yes. P0455 doesn't affect the 3.6L V6, 4WD, or any systems.