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Home >> Hummer >> 2005 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Troubleshooting >> Troubleshooting >> Malfunction Indicator Lamp (MIL) Always On >> Circuit Description
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Circuit Description

Voltage is supplied directly to the malfunction indicator lamp (MIL). The powertrain control module (PCM) turns the MIL ON by grounding the MIL control circuit.

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