P0455 — EVAP System Leak Detected (Large Leak)

P0455 means evap system leak detected (large leak). A large leak in the EVAP system — the equivalent of leaving the gas cap off. Big enough that the system can't hold any p

Safe to drive

You can keep driving — get it checked when convenient.

What it means

A large leak in the EVAP system — the equivalent of leaving the gas cap off. Big enough that the system can't hold any pressure.

Most likely causes, ranked

  1. Gas cap off, loose, or missing

    Check immediately — most common cause.

  2. Disconnected or broken EVAP hose

    Large split.

  3. Stuck-open purge or vent valve

    Can't seal.

  4. Cracked charcoal canister

    Impact or age.

  5. Rusted filler neck

    Large corrosion hole.

Typical repair cost

Typically $0–$500

Gas cap $15–$30; hose/canister repair typically $150–$500. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.

Get an AI diagnosis nowDescribe your symptom or enter your code — free

Common questions

Is P0455 serious?

Safe to drive, but check the gas cap now — if it's missing or the filler neck is damaged, fuel can splash out. Otherwise it's a vapor issue.

How much does it cost to fix P0455?

Typically $0–$500. Gas cap $15–$30; hose/canister repair typically $150–$500. Estimates vary by vehicle.

Can I drive with P0455?

You can keep driving — get it checked when convenient.

What causes P0455?

The most common cause is gas cap off, loose, or missing. Check immediately — most common cause.

Related