Battery Energy Control Module (BECM)
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Refer to the CHARGING SYSTEM - HIGH VOLTAGE TRACTION BATTERY -- FUSION, MILAN & MKZ (HYBRID) for more information on BECM and diagnostics.