Reverse Inhibitor
WARNING: This page is about a different car, the 2006 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.
The Shift Lever Assembly constantly monitors ABS wheel speed to prevents an inadvertent selection of reverse at speeds above approximately 6.4 Km/h (4 MPH). The Reverse inhibitor is part of the Shift Lever Assembly and is controlled by the Shift Lever Assembly module.