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2013 Low pitched buzzing noise from rear when car is locked

8031 Views 12 Replies 11 Participants Last post by  Steverino
I have noticed when going into the garage at night to charge the 2013 Volt, sometimes there is a low pitched buzzing noise constantly coming from near the rear axle. The only way I can turn it off is by starting the car and shutting it off again. The car is shut down and locked but the noise randomly starts after I leave it and come back later on. The noise continues until the car is turned on again. It sort of sounds like the mechanical sound the parking brake makes, but my parking brake is not on, the car is only in park and shut off. Has anyone experienced this? Thank you for any assistance.
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More than likely it is a pump that pressurizes the gas tank. How long it runs is probably dependent on how much fuel is in the tank. The less fuel the longer the pump will run (air is compressible, gasoline is not so much).

VIN # B0985
This. There's a fuel pressurization test that can take place when the vehicle is off. It makes a buzzing sound near the rear axle. It will stop buzzing on its own after a few minutes when the test completes.
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