Humming Yaris

[N9QGS]

(2007 Yaris S Sedan, 112,899 mi.) Okay I hope someone can share some insight. I had noticed over the last 3 weeks, when my car is stopped that I hear a humming coming from in the dashboard probably in the engine, its light in nature, but it seems to occur when Im in drive at a light or after putting the car in park. it tends to start at a low pitch hum and steady gets higher before disappearing, its very smooth in its change in pitch.

Too add to this I was able to have the hum sound occur very quickly sometimes when I shift between gears, doesn't seem to matter but lets say Reverse to Neutral, but its less than half a second, and its at the low sounding pitch always. but doesn't do this all the times.

On top of this when its doing the humming sound while stopped if I change the position of the steering wheel it can make it go away, it may start over after a few seconds.

never hear this sound while driving of course it have be covered by engine sound but I think its only occurring at idle. Any places to check?


I originally suspected maybe something with the power steering since it could go away with moving the wheel, but then when I noticed I could reproduce the sound briefly between shifts of the automatic, I kind ruled that out.

Ive added a link to the sound: http://public.me.com/n9qgs under folder Toyota Yaris, listen to hum.mp3, you will hear the increasing sound or hum, and then it stops, I changed shift the auto and it brought it back a little more.

Ron

[Phaeton]

Probably just a vibration from the engine, Mine does it too.

[Lafiro]

http://www.yarisworld.com/forums/showthread.php?t=22855

Read that thread, its in the General section right now. Its going off the topic so I may start a new thread. Now I see I am not to only one experiencing this.

Also shoot me your email and I can send you a short sound clip of the noise. Maybe its the exact same you have too, amoung a few other people here with the 07 yaris.

[127.0.0.1]

it is very likely the electronic steering assist. toyota service bulletins mention
you may hear it from time to time. tranny mode making the noise change ? still
could be steering (engine and tranny mounts and body twist will change it)

[JumpmanYaris]

Strange never happens to idk what it could be

[yaris-me]

With your mileage, it could be a lot of things or a combination of things, mainly because of wear. It could be water pump to bearings. You have to isolate it as much as possible.:frown:

[SilverBack]

Sounds like it's just the cooling fan doing it's job

[Lafiro]

Cooling fan is so loud and smooth, it has NOTHING to do with that I hear.

I tested it again tonight and its not as loud anymore since I tensioned the belt more, but I can not hear it from above the engine bay with the car on in gear obviously.

I can hear it easy from under the car, like when I open up the windows or the door. I think its easier to hear from the drivers side then the passengers.

But from the top of the engine, I do not hear anything. Very Very strange.

[yaris-me]

AC?:wink:

[YarisSedan]

Try getting fuel system service if you never had it done especially at your high milage. Will help quite down engine idle and roughness.

[craigq]

Our 2007 Sedan w/Auto creates the same humming noise.

I had a friend in the car and we came to a stop, the car started making the noise and he said "what's that?" and I said "Oh, the car is probably going to blow up" as the pitch was rising and rising. The resulting look on his face was classic :biggrin:.

[Lafiro]

Haha, my cousin asked the same thing when he heard the noise as well.

Also, I don't know how to service the fuel system.

And do we have to change out the fuel filter in our cars? If so, where is this located and what model # to get?

[trialsdork]

Mine's been doing it from day one. It happens when I put it in R backing out of my garag. A.C. on or off, hot or cold. I've wondered myself...

[yaris-me]

Mine's been doing it from day one. It happens when I put it in R backing out of my garag. A.C. on or off, hot or cold. I've wondered myself...

Yours may be the differential.:smile:

[Lafiro]

Last night I got home, and it was doing it again.

Put it in neutral, it stopped.

Put it in reverse, it started again. Opened the hood, I can't hear it. But I can hear it from under the car, its just too low to stick my hands there at night/while its in any gear!!

I put the ebrake, and stood outside kneeling down, and lef tit in reverse, and kept turning the streering wheel just as the engine RPM's went down, and I noticed the sound every time I tirned the wheel.

This does not happen in neutral, and it does not happen with the car off and the power steering assist being active.

So what the hell can this noise be? Its driving me inside that I cant figure it out.

Seems like I need to get the car lifted in the air after a drive, have someone sit in it in reverse or drive and start turning the wheel to put load on the engine/alt. And then see from underneigh whats going on.

Its really annoying.

[Red Horse]

This humming also happens to me when idle, Im thinking it might be the ABS but not sure.

[mhkritzinger]

hello!!

My 2006 yaris 1.3 got the same problem! it started doing it just after my odo struck 105000km. It happen usually when i'm stationary and my headlights are switched on or when i turn the steering wheel and the rpm drops a bit! mine sound like its coming from the rear left side of the car!

I climbed out one day and also noticed it underneath my car! i took it for a service and they couldn't find anything unusual!

It is really iratating and dunno what it could be!

[Lafiro]

Yes, I too noticed the noise is more predominant on the left undercarriage.

So now that I have enough people also stating the same noise in their 07-07 Yaris, its time for someone with a lift or a friend to test this out. Only way now to figure this out is to drive the car, immediately get it on a left, and have a mechanic take a look while you sit up top with it in drive or reverse while turning the wheel slightly to produce the noise(force the engine rpm's to go down).... this is not always needed to be done as I stated before getting off a highway and going to a drivethru for some fastfood, without turning the wheel its loud enough.

[Phaeton]

Mine has the same exact noise, same circumstances.

[mhkritzinger]

hey...

so could anyone find out something about the noise?

[Lafiro]

I still can't figure it out.

So I do not have any real means to get this checked out anymore.

[mhkritzinger]

man thats bad! my dealer told me that when the car is doing it ishould take it in to them but do you think i can get my car to make the noise when i get to the dealer?

Hope you guys can find something!

[Lafiro]

You must tell them to have a tech outside ready for your arrival to hear it before it goes away and testing becomes useless because your not leaving your car their overnight for another tech to abuse it without knowing what the problem is to begin with.

It has been colder these past few days, and on top of that i changed my serpentine belt, and yet, the noise is there, just no where near as loud.

Which makes me wonder if its one of the bottom two pulleys? Since now we can all agree the noise is dominant from under the car somewhere in the vacinity of the engine bay.

[Shroomster]

I'm going to throw out everything I can think of:

I'm leaning towards a rubber part or a stationary part....something not quite tight or fitted against another part properly


mainly plastic pieces like splash guards that can create a harmonic vibration...


but as to the fact that it gains in noise with acceleration I would think it'd be harmonic balancer on the crankshaft but thats a long shot way long shot.


It could be auto transmission clutches/bands that have worn and cause a slightly less than perfect operation during hot temps (seeing as it goes away when in neutral, correct?)

it could be engine tolerances are slightly out of spec (another very far shot)

thats all i can think of currently

[Lafiro]

From everyone who is having this noise;

Maybe it has something to do with the tranny, under strain, and low RPM's?

When is the last time anyone with this problem changed out their tranny oil?

Im on 54k miles, and still haven't changed it. I did post the question though in another thread, so I can try this and post my findings as soon as I can.

[craigq]

From everyone who is having this noise;

Maybe it has something to do with the tranny, under strain, and low RPM's?

When is the last time anyone with this problem changed out their tranny oil?

Im on 54k miles, and still haven't changed it. I did post the question though in another thread, so I can try this and post my findings as soon as I can.

FWIW I've done about 3 or 4 small-quantity/partial transmission fluid changes (using a 2.5L Pela vacuum pump). Shift quality seems the same since new, the noise was present for a while before the last fluid change and didn't go away after swapping out the fluid. I'll try to pay attention next time it makes the noise...

[mhkritzinger]

hey guys! I have caight my car doing the noise so i recorded it with my phone! ginna take to the dealer sometime next week and see what they have to say! will keep you posted! Have anyone figured something out yet?

[Lafiro]

Nope. Been sick, and its cold/moist or raining outside, so I haven't been able to check.

Please make sure they hear the noise while on a lift, because its from under the car somewhere MOST likely.

[N9QGS]

Okay I'm on the right topic, I agree its rpm possibly related cause the humming will stop if you move the wheel enough etc, I too originally thought it was power steering, but im like their is no pump, then when i heard it between certain shifts, I said well that I think ruled out steering, then I thought transmission, but mine started about 100,000, my tranny fluid has been changed on 2 occasions, and no it did not start after a change, but I will flush and refull my fluid this weekend, and see if it changes. I may try to get a recording of it tonight if it will do it. it does it enough that I think I can capture it with my zoom H2

[N9QGS]

Okay here is the sound: http://public.me.com/n9qgs go under Toyota Yaris and listen to hum.mp3

[Lafiro]

I also hear it when I am coming to a stop, probably from 8mph to 3mph, I hear it, then it goes away once I stop, then it comes back, and goes away, its annoying.

[N9QGS]

Lafiro,

Yours sounds like something related to a belt, it sound svery different then what Im calling a hum. Have you listened to my audio?

[N9QGS]

I re listened t my audio recording over normal speakers it was a little harder to hear, if you have the ability to listen through headphone you will hear it better I think, its a steadily rising hum or tone.

[mhkritzinger]

hey guys.. just wanna know if anyone figured something out yet?

[Lafiro]

Nope, I tried again today, no luck. Got another vibrational noise, noticed the airbox is loose and vibrating a lot with the engine and making contact with the car.

This is all becoming annoying :(

[Bob@MorganBingham.Com]

I also have a humming Yaris Sedan 2010 with automatic transmission. It has made an intermittent sound since the first week I had it. This was upon braking at a stoplight. I could stop this sound by shifting into neutral.
At 18,000 miles I took it back to Frontier Toyota in Valencia, California as the sound was louder.
Two techs heard the sound (I have it on Toyota letterhead). One of them in my presence on a test ride. He also thought it was making this sound while we were driving down the roadway. I have since noticed this can occur but is harder to hear while the car is in motion. He had never heard this type of sound before and it was coming from the "transmission side of the car." After a further check he kindly told me the automatic transmission had been "way overfilled." Good work factory guys.
The brake assist was replaced under warranty at a cost to Toyota of $800.
Sound persisted.
A THIRD tech heard it in my presence on a test ride. A humming sound upon stopping that a slight movement of the steering wheel can affect. He stopped the sound by placing the automatic transmission into neutral as I had been explaining. He said to the Service Manager that "This case needs to be reopened" and that he guessed to to possibly be an "ABS actuator", but not a safety issue.
The dealer kept this car three days afterwards. When I called to check - the gal on the phone said there was no paperwork. When the service manager said to come in - he walked me to the cashier and said there was "no paperwork" and to just call the car up. I received no paperwork as to what they were trying to do or any further repairs made.
The service manager said Toyota did not want to keep replacing parts on an intermittent sound. He advised me to keep driving it until the sound became more persistant and the warranty for such a thing was in the 40,000 mile range.
The sound still occasionally occurs.

[09sedan]

I also have a humming Yaris Sedan 2010 with automatic transmission. It has made an intermittent sound since the first week I had it. This was upon braking at a stoplight. I could stop this sound by shifting into neutral.
At 18,000 miles I took it back to Frontier Toyota in Valencia, California as the sound was louder.
Two techs heard the sound (I have it on Toyota letterhead). One of them in my presence on a test ride. He also thought it was making this sound while we were driving down the roadway. I have since noticed this can occur but is harder to hear while the car is in motion. He had never heard this type of sound before and it was coming from the "transmission side of the car." After a further check he kindly told me the automatic transmission had been "way overfilled." Good work factory guys.
The brake assist was replaced under warranty at a cost to Toyota of $800.
Sound persisted.
A THIRD tech heard it in my presence on a test ride. A humming sound upon stopping that a slight movement of the steering wheel can affect. He stopped the sound by placing the automatic transmission into neutral as I had been explaining. He said to the Service Manager that "This case needs to be reopened" and that he guessed to to possibly be an "ABS actuator", but not a safety issue.
The dealer kept this car three days afterwards. When I called to check - the gal on the phone said there was no paperwork. When the service manager said to come in - he walked me to the cashier and said there was "no paperwork" and to just call the car up. I received no paperwork as to what they were trying to do or any further repairs made.
The service manager said Toyota did not want to keep replacing parts on an intermittent sound. He advised me to keep driving it until the sound became more persistant and the warranty for such a thing was in the 40,000 mile range.
The sound still occasionally occurs.


gotta love the excellent toyota service they gave you... :bs:

[rudeboy1]

(2007 Yaris S Sedan, 112,899 mi.) Okay I hope someone can share some insight. I had noticed over the last 3 weeks, when my car is stopped that I hear a humming coming from in the dashboard probably in the engine, its light in nature, but it seems to occur when Im in drive at a light or after putting the car in park. it tends to start at a low pitch hum and steady gets higher before disappearing, its very smooth in its change in pitch.

Too add to this I was able to have the hum sound occur very quickly sometimes when I shift between gears, doesn't seem to matter but lets say Reverse to Neutral, but its less than half a second, and its at the low sounding pitch always. but doesn't do this all the times.

On top of this when its doing the humming sound while stopped if I change the position of the steering wheel it can make it go away, it may start over after a few seconds.

never hear this sound while driving of course it have be covered by engine sound but I think its only occurring at idle. Any places to check?


I originally suspected maybe something with the power steering since it could go away with moving the wheel, but then when I noticed I could reproduce the sound briefly between shifts of the automatic, I kind ruled that out.

Ive added a link to the sound: http://public.me.com/n9qgs under folder Toyota Yaris, listen to hum.mp3, you will hear the increasing sound or hum, and then it stops, I changed shift the auto and it brought it back a little more.

Ron

Did you ever find out what was making the humming noise?
I seem to have the same issue