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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Description and Operation >> Charging System Description and Operation >> Charging System Operation >> Charge Mode >> Fuel Economy Mode

Fuel Economy Mode

The generator battery control module will enter Fuel Economy Mode when all of the following conditions are true:

The targeted generator output voltage is 13 volts. The generator battery control module will exit this mode once the criteria are met for Charge Mode or it will boost voltage to a pre-determined set point for the fuel pump, headlamps, or windshield wipers.