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Malfunction Indicator Lamp (Mil) Always On: Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition voltage is supplied to the Malfunction Indicator Lamp (MIL). The Engine Control Module (ECM) turns the MIL ON by grounding the MIL control circuit. See WIRING DIAGRAMS .

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