- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0442 code.

Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.

- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.

P0442 INFINITI
P0442 NISSAN
P0442 SUBARU
P0442 PONTIAC
P0442 SATURN
P0442 DODGE
P0442 CHRYSLER
P0442 JEEP
P0442 BMW
P0442 FORD
P0442 HONDA
P0442 ACURA
P0442 HYUNDAI
P0442 ISUZU
P0442 KIA
P0442 LEXUS
P0442 TOYOTA
P0442 MAZDA
P0442 MITSUBISHI
P0442 VOLKSWAGEN
P0442 AUDI
P0442 CHEVROLET
P0442 BUICK
P0442 CADILLAC
P0442 GMC
P0442 2001 DODGE CARAVAN