P0455 Jeep Wrangler
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 Wrangler 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 Wrangler.
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 Wrangler.
Common Causes on Jeep Wrangler
- Gas cap missing or damaged from off-road use
- EVAP vapor line severed from undercarriage trail impact
- Charcoal canister cracked from rock contact
- EVAP purge solenoid stuck open
- Fuel tank vent hose completely disconnected from chassis flex
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 Wrangler
Wrangler and Gladiator EVAP systems are vulnerable to off-road damage. Consider adding underbody protection for EVAP components on trail-driven vehicles.