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Posts Tagged: P0442 Evaporative Emission Control System Leak Detected

Diagnose P0442 or P0456

Diagnose P0442  or P0456 Test for P0456 Evaporative Emissions System – Small leak detected or P0442 Evaporative Emission Control System Leak Detected (small leak) These codes indicate that the Evaporative Emissions System has failed a leak test. For more information on what the EVAP system is and how it works, see this article. To perform the test the computer energizes the vacuum management valve (VMV) vent valve that opens the fuel system to fresh air. Then it opens the VMV purge valve that opens the system to engine vacuum. The … Read More


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