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DTC P1781: TCM Mil Request Circuit: Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Control Module (TCM) Malfunction Indicator Lamp (MIL) request circuit signals the Engine Control Module (ECM) that the TCM is requesting MIL illumination.

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