P0455 Jeep Cherokee
EVAP System Leak Detected (Gross Leak) · Powertrain Code · Medium · Repair: Easy
What is P0455?
A large leak has been detected in the EVAP system. Check gas cap first — if secure, look for disconnected or cracked EVAP hoses, a stuck-open purge valve, or a leaking charcoal canister.
When the Jeep Cherokee triggers code P0455 (evap system leak detected (gross leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Jeep Cherokee.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Jeep Cherokee.
Common Causes on Jeep Cherokee
- Gas cap missing or not sealing
- EVAP purge solenoid stuck wide open
- Large EVAP vapor line disconnection
- Charcoal canister housing cracked
- Fuel tank seal failure
Symptoms
- Check engine light illuminated
- Noticeable fuel smell near vehicle
- Gas cap warning light on dashboard
- Failed emissions test
- Fuel economy noticeably decreased
Notes for Jeep Cherokee
Grand Cherokee and Cherokee P0455 is commonly a gas cap or stuck-open purge solenoid. Quick repair in most cases.