Overdrive Range, Fourth Gear - Torque Converter Clutch Applied (With Electronic Range Select Mode): Notes
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
When operating conditions are appropriate, the PCM energizes the 1-2 shift solenoid valve in order to shift the transmission into Fourth gear. In addition, the TCC is applied in Fourth gear. The manual valve remains in the Overdrive position and line pressure continues to feed the Drive and the PRND4 fluid circuits.