WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Oil Level Control Valve Into The Transmission Case
Courtesy of GENERAL MOTORS CORP.
Install the oil level control valve into the transmission case (51). Push straight down on the center of the oil level control valve in order to prevent damage to the case bore.