2003 Volkswagen Passat Logo
Blake Kennedy
Blake Kennedy Posted on Nov 19, 2013
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Hum/Buzz coming from engine when off

I have a 1.6 Passat and there is a buzzing/humming noise coming from the engine when it is off. This can keep going until the battery is dead. The engine light has now started to come on

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  • Expert 69 Answers
  • Posted on Nov 19, 2013
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Joined: Nov 19, 2013
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SUSPECT AN ELETRICAL WATERPUMP IS RUNNING

3 Related Answers

Molson02536

Harvey N Tawatao

  • 3854 Answers
  • Posted on Jul 12, 2009

SOURCE: 99 VW Passat Engine Humming Noise

It could be your alternator has gone bad and over charging the electrical system and the bearing to the alterntor has gone bad also and will need to be replaced soon as posible. If you have a volt meter check the voltage at the battery when the care is running and there should be no more then 13.5 volts, anthing higher and your going to need a new battery soon. If there a Auto Zone around your area, they can check the voltage for you and may be determine where the noise is coming better then us on line since where not there. Good luck and hope this helps. If it is the alternator, Auto Zone may and can order the parts and give the step by step instructions to replace the parts with common tools or ask one of the guys to help you work on the car after work for less then the dealer's cost for the repairs. Good luck and keep me posted. be glad to help you get your car running 100% again soon.

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Anonymous

  • 7 Answers
  • Posted on Feb 24, 2010

SOURCE: loud rattling noise coming from the engine

Are you losing power as well? if so it sounds like the camshaft is worn, this can be confirmed with a compression test

Larry Chandler

  • 1149 Answers
  • Posted on Mar 26, 2010

SOURCE: Have a strange humming noise that can be heard

Hi:
Often "humming" noises like what you are experiencing are caused by a failing bearing somewhere. Some usual suspects are wheel bearings, alternator bearings, and sometimes even your waterpump, but usually it starts leaking too. To start narrowing down what it is, have someone ride with you to see if the noise is coming from left side or right side, or engine area, then see if it happens when the car is not moving, or just when the drive wheels are pulling the car? This way , hopefully you can pin point the culprit!

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That "speaker looking thing" above the drivers head on the headliner is a part of the climate control system.

Here is the GM bulletin regarding it if you are running in to these issue:

Document ID# 1639237

Subject: Buzz Noise From Headliner Above Driver - keywords ac air aspirator cover fan grille HVAC interior microphone sensor speaker temperature vent vibration #PIT3511 - (03/29/2005)



Models: 2000-05 Cadillac Escalade

2002-05 Chevrolet Avalanche

2000-05 Chevrolet Silverado, Suburban, Tahoe

2000-05 GMC Sierra, Yukon, Yukon XL, Yukon Denali

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

Condition/Concern:
Dealer or customer may comment that they have a buzz or vibration noise emanating from the headliner in an area that looks like microphone or a speaker.

Recommendation/Instructions:
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