Circuit/System Description
WARNING: This page is about a different car, the 2009 Saturn Vue. 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 (TCM). This fault is handled inside the TCM and no external circuits are involved. The TCM is part of the control solenoid (w/body and TCM) valve assembly, and is not serviced separately.