B0780 01
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The TCCM detects 3.4 V or greater on the 4 Low indicator control circuit when the 4 Low indicator is commanded ON.