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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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My car makes all sorts of whirring noises periodically near the fuel tank. It's creating pressure (or was it a vacuum) to help the fuel last longer. There was a service bulletin to get part of the system replaced. Maybe you have an old one?
 

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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
 

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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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Heard buzzing sound coming from the rear, which disappeared when the car was turned on and off. Only happened one time.
 

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2017 here -- and when I turn the car off there's some clicks and noises as it activates the charging system, but no buzzing or anything like that starting out. I have the pedestrian noise maker fuse pulled to, car is silent as a mouse as I pull out and get underway.
 

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The consensus is the fuel pressurization system. This is normal. Don;t worry about it and don't try to make it stop by turning in and off the car.

Similarly, in the summer when parked in a hot garage, there will be whirring as well as fan noises up front where the temp management system works to cool the battery (and warm the garage). I've started to charge after dark at times or park outside and charge at 110v to keep my garage cooler so I can work on projects in there. I really need to build a shed for my vehicles and toys out by the horse barn.
 

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It is actually running an evaporative emission diagnostic. A pump pulls a vacuum in the fuel tank to determine if there is a leak.
 
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