P0442 Jeep Grand Cherokee
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 Jeep Grand Cherokee 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 Jeep Grand Cherokee.
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 Jeep Grand Cherokee.
Common Causes on Jeep Grand Cherokee
- Gas cap worn or not engaging properly
- EVAP purge solenoid not sealing
- EVAP vapor line cracked near fuel tank
- Fuel tank vapor hose connection loose
- Charcoal canister deterioration
Symptoms
- Check engine light illuminated
- Faint fuel smell near vehicle
- Slightly reduced fuel economy
- Failed emissions test
- Occasional rough idle after refueling
Notes for Jeep Grand Cherokee
Grand Cherokee and Cherokee EVAP purge solenoids are a common failure point. Located on the intake manifold, they are accessible for replacement.