Hybrid Low, 1-2 Clutch Assembly
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
HL 12 clutch fluid exhausts from the hybrid low, 1-2 clutch to the shift solenoid valve - mode B allowing the hybrid low, 1-2 clutch to release.