Evaporative Emission System Leak Detected (Large Leak)
A large leak has been detected during the EVAP system pressure or vacuum test — large enough that the system cannot hold pressure for the diagnostic interval. Typically a missing fuel cap, disconnected hose, or split canister.
Affected components
- Fuel filler cap
- Evap canister
- Evap hose
Common causes
- High likelihood: Fuel cap missing or not seated
- High likelihood: EVAP hose disconnected
- Medium likelihood: Charcoal canister cracked
Possible symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.