Investigating P0455 on Your 2019 Jeep Grand Cherokee
P0455 on your 2019 Grand Cherokee WK2 means the PCM found a large EVAP leak. Whether you have the 3.6L V6, 5.7L HEMI, or 3.0L EcoDiesel, the diagnosis starts the same way—check the gas cap.
Clues
- Check engine light with P0455
- Possible fuel smell
- Gas cap worn or loose
- Failed emissions test
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Degraded after 5+ years. $10–$25.
- EVAP Canister Vent Valve (Medium Likelihood): FCA vent valve. $150–$300 installed.
- Purge Solenoid (Medium Likelihood): Sticking valve. $140–$280 installed.
- Vapor Line (Low-Medium Likelihood): Heat or trail damage. $100–$250.
- Charcoal Canister (Low Likelihood): Saturated. $200–$400 installed.
Diagnosis
New gas cap first. If P0455 persists, get a smoke test. FCA dealers use wiTECH for integrated EVAP diagnostics. Independent shops with smoke machines work just as well.
Warranty
Basic warranty has expired. The federal emissions warranty (8yr/80k) covers EVAP through 2027. Check your mileage.
Safe to Drive?
Yes. P0455 doesn't affect any engine option, 4WD, Quadra-Trac, or Selec-Terrain.