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P0442 - Evaporative Emission Control System Leak Detected Small Leak

Possible causes
- 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
Tech notes
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.
When is the code detected?
Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0442 Description

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 Information for specific makes
P0442 ACURA EVAP System Very Small Leak Detected
P0442 AUDI EVAP System Small Leak Detected
P0442 BMW Evaporative Emission System Leak Detected Small Leak
P0442 BUICK Evaporative Emission Control System Leak Detected Small Leak
P0442 CADILLAC Evaporative Emission Control System Leak Detected Small Leak
P0442 CHEVROLET Evaporative Emission Control System Leak Detected Small Leak
P0442 CHRYSLER Evaporative Emission Control Small Leak Detected  P0442 Video
P0442 DODGE Evaporative Emission Control Small Leak Detected  P0442 Video
P0442 FORD Evaporative Emission System Leak Detected Small Leak
P0442 GMC Evaporative Emission Control System Leak Detected Small Leak
P0442 HONDA EVAP System Very Small Leak Detected
P0442 HYUNDAI EVAP System Leak Detected Small Leak
P0442 INFINITI EVAP Control System Leak Detected Small Leak  P0442 Image
P0442 ISUZU Evaporative Emission Control System Leak Detected Small Leak
P0442 JEEP Evaporative Emission Control Small Leak Detected
P0442 KIA EVAP Emission System- Leak Detected Small Leak
P0442 LEXUS EVAP System Small Leak Detected
P0442 MAZDA Evaporative Emission Control System Leak Detected Small Leak
P0442 MERCEDES-BENZ Evaporative Emission Control System Leak Detected Small Leak
P0442 MITSUBISHI EVAP System Small Leak Detected
P0442 NISSAN EVAP Control System Leak Detected Small Leak  P0442 Image
P0442 PONTIAC Evaporative Emission Control System Leak Detected Small Leak
P0442 SATURN Evaporative Emission Control System Leak Detected Small Leak
P0442 SUBARU Evaporative Emission Control System Malfunction
P0442 TOYOTA EVAP System Small Leak Detected
P0442 VOLKSWAGEN EVAP System Small Leak Detected
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