DTC P0700: TCM Mil Request: 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 Malfunction Indicator Lamp (MIL) request circuit signals the Engine Control Module (ECM) that the transmission control module (TCM) is requesting MIL illumination.