What are the symptoms of P0442?

MIL on, no drivability symptoms. Faint gasoline smell near fuel cap area (rare)

Remove and reinstall gas cap firmly until it clicks; clear code, drive, recheck. Replace gas cap ($8–25) if code returns — most common definitive fix. Smoke-test EVAP system from service port to locate leak if cap replacement fails. Replace faulty purge solenoid or vent valve if leak is localized there

P0442

Evaporative Emission System Leak Detected (Small Leak)

🟢 MONITOR — NOT URGENT POWERTRAIN · EVAP System

EVAP monitor detected a leak approximately 0.020" or smaller in the fuel vapor system.

What You'll Notice

MIL on, no drivability symptoms
Faint gasoline smell near fuel cap area (rare)

Probable Causes

Gas cap not tightened properly after fill-up — check here first, free fix
Cracked or deteriorated gas cap seal
Purge valve or vent valve leaking internally
Cracked EVAP charcoal canister hose or canister itself

Direct Repair Steps

Remove and reinstall gas cap firmly until it clicks; clear code, drive, recheck
Replace gas cap ($8–25) if code returns — most common definitive fix
Smoke-test EVAP system from service port to locate leak if cap replacement fails
Replace faulty purge solenoid or vent valve if leak is localized there

Vehicles Affected

chevy ford honda toyota jeep bmw subaru