Circuit/System Description
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The electronic brake control module (EBCM) and the power take off module (PTOM), if equipped, monitor the battery positive (B+) voltage level available for system operation. A low voltage condition prevents the system from operating properly. If low voltage is detected by the EBCM or PTOM, then DTC C0899 sets.