Fuel Economy Mode
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The BCM will enter Fuel Economy Mode when the estimated battery temperature is above 0°C (32°F), the calculated battery current is less than 15 amperes and greater than -8 amperes and the battery SOC is greater than 80 percent. Its targeted generator output voltage is the open circuit voltage of the battery and can be between 12.56 volts and 13.2 volts. The BCM will exit this mode once the criteria are met for Charge Mode.