Lexus ES 2013+ :: Humming Sound At The Back Of Car


Apr 27, 2013

2013 ES350 silver for my wife - bought 3 months ago and drove 600 miles.

About one month ago, I could hear a humming sound at the back of the car (somewhere around backseat or in the trunk). At that time, car was parked in the garage. This sound is similar to having several honey bee in that area and humming at the same time. The sound disappeared by itself after several hours.

Yesterday, it happened again. We parked the car in the garage around 4pm and did not hear this sound at that time. At around 10pm, when I went to garage to get some tools, I heard this humming sound again. This morning, as soon as I woke up, I checked the car and the sound is gone.

I am not sure if there are any other reports of similar issue for 2013 ES350, or maybe this issue is just for my particular car? And this humming sound is not always there, so I am not sure how to repeat it in the repair department. Maybe I need to bring it to delaership and just let service technician take a look.

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My ES350 is always parked in my garage. One afternoon, I went into the garage to get something and I heard a humming sound coming from the car. It was very hard to identify where it was coming from. It sounded like a low horsepower compressor of some sort. I put my ear next to the rear wheel on the drivers side as this was the area the noise appeared to be coming from.

This is the second time I've experienced this happening. A couple things to note:

1. The car had not been operational for at least 8 hours.
2. There was no indicator lights on the dashboard flashing.
3. All doors were closed.
4. It seems to happen intermittently and I can't replicate on my own.

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I recently did some suspension work and I don't know if this is somehow related or if I'm now just extra sensitive to the sounds my car makes after the work was done. Perhaps the auto parking brake disengaging?

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I purchased my .:R last summer with just over 100k miles on it. Two prior owners, car was fully stock and in great condition except for one thing:

Humming/vibration ("brrrrr" sound) coming from the back of the car when turning at a slow speed with the wheel fully cranked, e.g. moving out of a parking spot. It only occurs when moving, and with the wheel fully or almost fully turned in one direction.

The guy I purchased it from brought it to a local VW dealership when he noticed this and they (obviously) did not find anything wrong with the car, and blamed it on the tire wear.

So I changed all four tires. Still made the noise.

Haldex oil had been changed by the original owner but not by the second owner (who owned the car for two years prior to my purchase). So I had the Haldex oil changed and my mechanic said it was dirty AND at a low level, and might be the source of this problem. The noise did diminish for a bit, but it is still present.

So, I'm afraid my transmission or differential are fried from running on too little oil. It does not affect anything but it is definitely worrying me.

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I love the car, but had a few small gripes, including ride firmness and road noise. Well, the ride firmness has definitely calmed down a great deal over the first 3500 miles to now I find it has a perfect balance of handling vs. comfort. It's firm, but the bumps are not as jarring as those first 500 miles or so. I'm very happy with it.

The 2nd issue I hd/have, is road noise... or rather... I think... suspension noise. It's a faint droning/humming sound that I think comes mostly from the rear. You can start hearing it at 20-30mph on all but the smoothest of roads. The noise seems to be *in addition* to the very, very minimal tire noise I hear from the very nice stock Michelins. The harsher the road, the louder the noise of course.

My guess (and it's only a guess?) is that the metal bushing ('pillow ball') in the rear along with the other firmer suspension parts are the primary cause of this noise.

So I have tried a couple of things to try and counteract this noise:

1) Put D'amplifier Pro in the trunk - Got down the bare metal and put the stuff all of the place back there... Above the wheel wells also.

This did not stop the noise I hear.

2) I then put some sound deadening foam mats above both rear wheel wells.

This did not work.

The strange thing is that this noise is pretty faint, but unmistakable... however if I move my head forward (say, right in line with the steering wheel) 2 feet.... I barely hear it. But when I move back to the normal driving position, there it is.

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My ABS Light is on. When I slowly brake at low speed and when the brake is almost completely depressed... I hear a low humming sound, and the brake pedal seems to momentarily drop back just slightly. This also happens when I'm going down hill and breaking. For the most part, the car breaks, and it's only every 8th or 10th time braking that I experience this issue.

My guess is this is linked to the ABS... but I can't afford expensive service and need to resolve this on my own.

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1. On gas (accelerating), when hit 70mph (not even 69 mph) I start hearing humming sound. It will last till 73mph and goes away. Not able to pin point the source. I feel it is originating somewhere closer to transmission shift.

2. Decelerate from above 73mph and no gas given, when hit 70 I don't hear the sound. Press the gas pedal, I hear.

3. Set the cruise at 70, I hear.

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