Tracking Down P0455 on Your 2021 Jeep Cherokee
P0455 on your 2021 Cherokee KL means a large EVAP leak. Whether you have the 2.4L Tigershark or 3.2L Pentastar V6, the diagnostic approach is the same. Gas cap first.
Evidence
- Check engine light on
- P0455 stored in PCM
- Possible fuel odor
- Gas cap not seating
Causes by Likelihood
- Gas Cap Seal (Very High Likelihood): Loose or worn. $10–$25.
- EVAP Canister Vent Valve (Medium Likelihood): FCA vent valve failure. $150–$280 installed.
- Purge Solenoid (Medium Likelihood): Sticking. $140–$260 installed.
- Vapor Line (Low Likelihood): Cracked connection. $100–$220.
- Charcoal Canister (Low Likelihood): Saturated. $200–$380 installed.
Diagnosis
Replace the gas cap and drive 2–3 days. If P0455 persists, get a smoke test. FCA dealers use wiTECH for EVAP diagnostics.
Warranty
Your 2021 Cherokee's basic warranty (3yr/36k) has likely expired. Federal emissions warranty (8yr/80k) covers EVAP through 2029.
Safe to Drive?
Yes. P0455 is a vapor code. The engine, 4WD, and all systems work normally.