You just turned off your truck. The ignition is off and the keys are in your hand. All of a sudden you hear a humming or buzzing sound from the rear. As you scratch your head in bewilderment there might be an answer to the puzzling sound.
General Motors has learned that some 2007 GM trucks equipped with a 5.3-liter or 6.2-liter engine might develop a humming or buzzing sound from the rear. They discovered the cause of the noise is a faulty relay that intermittently completes the circuit to the fuel pump. Not only does it cause a humming sound but it might cause a dead battery.
To fix the trouble engineers developed an updated relay. Installation of the updated part should cure the trouble.
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