Drive, Intermediate and Low Range - Second Gear: Notes
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
As vehicle speed increases and operating conditions become appropriate, the TCM de-energizes the reverse, 1st shift solenoid valve assembly (S1) and energizes the 2-3, 3-4 shift solenoid valve assembly (S2) to shift the transmission into Second gear. The manual valve remains in the DRIVE (D) position and line (2) pressure continues to feed the drive (19) fluid circuit.