Power Liftgate Interface
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
Power liftgate open operation requires the vehicle to be in PARK and the vehicle speed to be less than 5 km/h (3 mph). The power liftgate receives information over the CAN from the PCM for the PRNDL position and from the instrument cluster (gateway) for the vehicle speed. These inputs have network DTCs. If any vehicle speed sensor (VSS) or transmission range switch DTCs are retrieved and the power liftgate is not operating, repair these DTCs first.