P0442 Ford F-150
EVAP System Leak Detected (Small Leak) · Powertrain Code · Low · Repair: Easy
What is P0442?
A small leak has been detected in the EVAP system. Common causes include a loose or cracked gas cap, cracked EVAP hose, or faulty purge/vent valve.
When the Ford F-150 triggers code P0442 (evap system leak detected (small leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Gas cap worn or improperly sealed
- EVAP canister vent valve (CV solenoid) failure
- Cracked EVAP line between fuel tank and canister
- Fuel vapor line connector loose at fuel tank
- Charcoal canister saturation from tank overfilling
Symptoms
- Check engine light illuminated
- Faint fuel smell near vehicle
- Slightly reduced fuel economy
- Failed emissions test
- Occasional rough idle after refueling
Notes for Ford F-150
Ford F-150 EVAP canister vent valve failures are common. The vent valve is located near the charcoal canister at the rear of the vehicle.