WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: ECM Location
Courtesy of CHRYSLER LLC
Disconnect negative battery cable.
Disconnect ECM electrical connectors (1).
Remove ECM bracket to inner fender retaining nuts (5).