Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The shift solenoid (SS) valve 3 is a normally open valve that mounts into the transmission case. The SS valve 3 controls the modulator pressure to the shift valve 3, as commanded by the powertrain control module (PCM). When the PCM energizes the SS valve 3, it closes the passage to the shift valve 3, and the modulator pressure is exhausted. When the PCM de-energizes the SS valve 3, it allows the modulator pressure to apply to the shift valve 3. The PCM has a diagnosis circuit inside, to monitor the voltage level to the SS valve 3, and receives a return signal.
When the PCM detects a short to ground on the SS valve 3 high control circuit, DTC P0979 sets. DTC P0979 is a type A DTC.
Refer to Shift Solenoid Valve State and Gear Ratio .