Question about 2003 Volkswagen Passat

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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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Posted on Nov 19, 2013


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Posted on Jan 02, 2017

  • 3854 Answers

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.

Posted on Jul 12, 2009

  • 7 Answers

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

Posted on Feb 24, 2010

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SOURCE: Have a strange humming noise that can be heard

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!

Posted on Mar 26, 2010

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1 Answer

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Hi: If you just bought the car there should be some kind of recourse with the dealer, There are lemon laws to protect the buyer. Check it out. It could be the fuel pump losing it's prime and the hum you hear could be the pump going on to restore it's prime. Good Luck

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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.

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.

The plastic escutcheon grill, which is round and about the size of a half dollar and located just above the driver to the left, is the interior ambient temperature sensor. The sensor is used in conjunction with the automatic HVAC (C68). On occasions, this sensor has been known to make a buzz or rattle sound. The sensor uses a small fan to pull air over the sensor. This buzz noise may be intermittent.

Although it may not be possible to alleviate all of the buzz or noise from this sensor, Engineering has found that if the sensor is installed incorrectly that it may bind and cause the fan to make a buzz noise. Remove the sensor and while doing so check for any binding. Reinstall the sensor and re-test. If the noise is still present, the sensor itself may be noisy and require replacement.

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Front washer want spray checked the fuse its good

First check the nozzle to be sure it is not blocked. Then listen for the washer pump to buzz, or hum when you turn the washers on if you dont hear any noise you most likely need to replace the washer pump.

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95 Toyota Camry Speakers hum and buzz when car is off.

There is a major short somewhere,the hum you hear in the speaker
is the frequency of the DC electricity flowing through the speaker coils,do all four speakers hum or just one?Do you have a stock or aftermarket stereo?

May 15, 2009 | 1995 Toyota Camry

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