P0455 on a 2013 Jeep Wrangler

P0455 means the EVAP system failed a leak check badly enough that the computer sees a large leak or no pressure/vacuum change.

Not your vehicle? See general P0455 info.

Most common causes on the 2013 Jeep Wrangler

Ranked from 647 NHTSA owner complaints filed for this vehicle.

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1
Cracked fuel tank or fuel pump/sending module assembly
High severity
Owners on this vehicle found actual cracks in the fuel tank or fuel module leaking fuel, which is a large, easily-detected leak path consistent with P0455.
Reported in 4 NHTSA complaints
Parts:fuel tank fuel pump module
2
Fuel-fill/vent valve malfunction causing overfill at the pump
Medium severity
Reports of gas gushing back out at the filler or the nozzle clicking off early point to a stuck or failed tank-venting valve, a large-leak-equivalent fault.
Reported in 2 NHTSA complaints
Parts:evap vent valve fuel filler neck
3
Loose, missing, or damaged gas cap
Low severity
P0455 is a LARGE-leak code, and a cap left loose or with a torn seal is the single most common way to trigger it; try tightening/replacing the cap first.
Common cause
Parts:gas cap
4
Rusted or corroded filler neck
Medium severity
A rusted-through filler neck is a common large-leak source in older Jeeps driven in salt-belt climates.
Common cause
Parts:filler neck
5
Cracked or disconnected EVAP hose/line
Medium severity
A fully split or popped-off EVAP hose produces a leak large enough to fail the large-leak monitor.
Common cause
Parts:evap hose
6
Stuck-open purge valve
Medium severity
A purge valve stuck open lets the system leak down immediately during the EVAP monitor's pressure test.
Common cause
Parts:purge valve
7
Cracked charcoal canister
Medium severity
A split canister housing is a large enough opening to set a P0455 rather than the smaller P0442.
Common cause
Parts:charcoal canister

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0455 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Fuel smell
Usually no performance issue
Failed emissions readiness

What to check before replacing parts

Check the gas cap first

Look for: A loose, missing, or cross-threaded cap is by far the most common cause of a large EVAP leak code — if it doesn't click to full tightness or the seal is cracked, that's very likely the whole fault.

Inspect visible EVAP hoses

Look for: A large leak is often obvious: a hose disconnected at a fitting, split open, or chewed through (rodent damage is common) rather than a hairline crack.

Command the purge and vent valves with a scan tool

Look for: A valve that doesn't respond at all when commanded open/closed, or stays open when it should seal, prevents the system from holding pressure/vacuum and reads as a large leak.

Smoke-test the system

Look for: With a large leak, expect an obvious plume of smoke or a clearly audible hiss at the fault location — it should be easy to spot compared to a small-leak diagnosis.

Inspect the canister and filler neck

Look for: A cracked charcoal canister housing or a corroded/rusted-through filler neck (common on older vehicles) can leak enough to prevent the system from ever holding vacuum.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Check Engine Light