Question about 2004 Hummer H2
P0442 CODE MEANS EVAPORATIVE EMISSION SYSTEM SMALL LEAK DETECTED
CHECK EVAP HOSE & CONNECTIONS, INTAKE FOR LEAKS, EVAP CANISTER, OR EVAP CANISTER PURGE VALVE
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
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The MIL turns OFF after the engine is started if a diagnostic fault is not present.
The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
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READING CODES USING MIL (CHECK ENGINE) LAMP
Be advised that the MIL or CHECK ENGINE light can only perform a limited number of functions and it is a good idea to have the system checked with a scan tool to double check the circuit function.
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