Drive Range - Fourth 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.
When operating conditions are appropriate, the TCM de-energizes the 1-2, 2-3, reverse shift solenoid valve assembly (S3) to shift the transmission into Fourth gear. The manual valve remains in the DRIVE (D) position and line (2) pressure continues to feed the drive (19) fluid circuit.