Circuit / System Description
WARNING: This page is about a different car, the 2021 Cadillac XT6. However, it is still accessible from the selected car via links, so may be relevant.
The solenoid valve directs pressurized fluid to exit the accumulator to apply the clutches for a 1st gear start, during an Auto Start event.
For an overview of the component / system, refer to: Park - Engine Running (Hydraulic Circuits)Park - Engine Running (Mechanical Powerflow)