P0446 on a Jeep: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can drive it, but fix the vent system soon if you notice fuel smells or trouble filling the tank.

What P0446 means on a Jeep

On a Jeep, P0446 means the vent valve that lets air into the EVAP canister is not working correctly — it may be stuck, clogged, or have a wiring fault. When the vent can't open, pressure builds in the fuel tank. The engine runs normally, so the check engine light is the main sign.

Is P0446 common on Jeeps?

P0446 shows up on Jeeps like the Wrangler, Cherokee, and Grand Cherokee as the vent valve near the charcoal canister ages. Off-road driving can expose the canister and vent lines to dirt, mud, and rocks, which can clog or damage them. A stuck vent valve is the most common cause, with bad wiring close behind.

Commonly reported on: Wrangler, Cherokee, Grand Cherokee.

Symptoms

Check engine light on
Faint fuel smell near the rear of the vehicle
Slow fuel filling or nozzle clicks off early
No change in power or drivability

Common causes

most common: Vent valve stuck closed or failing
common: Clogged or damaged vent line from dirt and debris
common: Faulty vent valve wiring or connector
less common: Damaged charcoal canister

How to fix it

Fix	DIY?	Typical cost
Replace the vent valve	Yes	$60–190
Clear or replace a clogged vent line	Yes	$30–100
Have a shop test the vent circuit and replace the valve	Mechanic	$150–360
Replace the charcoal canister assembly	Mechanic	$300–600