What this code means

The PCM has detected a large leak in the Evaporative Emission Control System, or there is no flow through the system. This indicates a significant breach in the sealed EVAP system.

Symptoms

• Check Engine Light
• Fuel odor
• Poor engine performance possible
• Difficulty refueling
• Failed emissions test

Common causes

• Loose or damaged gas cap (most common)
• Cracked or disconnected EVAP hoses
• Faulty purge valve
• Damaged charcoal canister
• Fuel tank or filler neck damage
• Missing or damaged EVAP system component

Diagnostic steps

1. Inspect gas cap — tighten or replace
2. Visual inspection of all EVAP hoses and connections
3. Smoke test EVAP system to locate leak
4. Test purge and vent valves
5. Inspect charcoal canister
6. Check fuel filler neck

Repair notes

Replace gas cap first (most common). Smoke test to find larger leaks. Replace damaged hoses or components.

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