P0455 on a Jeep: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

Safe to drive — this is an emissions leak, not an engine problem. Fix it before your next emissions test.

What P0455 means on a Jeep

On a Jeep, P0455 means the EVAP system has a large leak and fuel vapors are escaping. The Jeep will still run and drive normally, so the check engine light is usually the only symptom. It's an emissions issue, not a drivability issue.

Is P0455 common on Jeeps?

P0455 shows up on Jeeps of all ages, from Wranglers to Grand Cherokees, Cherokees, and Compasses. Off-road use can knock hoses loose or crack the plastic EVAP lines that run under the body. A loose gas cap from a rough trail ride is a common trigger.

Commonly reported on: Wrangler, Grand Cherokee, Cherokee, Compass.

Symptoms

Check engine light is on
Possible faint fuel smell
Usually no driving symptoms

Common causes

most common: Loose, missing, or damaged gas cap
common: Cracked or disconnected EVAP hose or line
common: Faulty EVAP purge or vent valve
less common: Crack in the charcoal canister

How to fix it

Fix	DIY?	Typical cost
Tighten or replace the gas cap	Yes	$10–30
Inspect and reconnect or replace damaged EVAP lines	Yes	$15–80
Have a smoke test performed to find the exact leak	Mechanic	$50–150
Replace a faulty purge or vent valve	Yes	$40–160

Frequently asked questions

Can I drive my Jeep with a P0455 code?

Yes. A P0455 is an emissions leak, not an engine problem, so the Jeep will drive normally. Fix it before your next emissions test.

Why does my Jeep keep setting P0455 after off-roading?

Trail use can loosen the gas cap or knock EVAP lines loose under the body. Check the cap first, then look for disconnected hoses before paying for a smoke test.

How much does it cost to fix P0455 on a Jeep?

Usually under $200. A gas cap costs about $10–30, a smoke test runs $50–150, and a purge valve replacement is typically $40–160.