Shift Solenoid Valves
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
See 1-2 AND 2-3 SHIFT SOLENOID VALVES under TRANSMISSION under MISCELLANEOUS CONTROLS.