P0442 RAM 1500
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 RAM 1500 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 RAM 1500.
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 RAM 1500.
Common Causes on RAM 1500
- Loose or worn gas cap
- EVAP vent solenoid stuck partially open at charcoal canister
- EVAP vapor line damaged by road debris
- Fuel tank seal leak at sending unit gasket
- EVAP purge solenoid slow leak
Symptoms
- Check engine light illuminated
- Faint fuel smell near vehicle
- Slightly reduced fuel economy
- Failed emissions test
- Occasional rough idle after refueling
Notes for RAM 1500
Ram 1500 EVAP vent solenoids near the charcoal canister are a common failure. Located at the rear of the vehicle behind the spare tire on some models.