Circuit/System Description
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
This is an internal fault detection of the transmission control module. This fault is handled inside the transmission control module and no external circuits are involved. The transmission control module is part of the control solenoid valve assembly, and is not serviced separately.