Conditions for Setting the DTC: P0973
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.
The control solenoid (w/body and TCM) valve assembly detects an internal low voltage electrical malfunction of the SS 1 control circuit when SS 1 is commanded OFF for 400 milliseconds in a 500 millisecond sample.