This problem happens only when you raise the RPMs. I turned my A/C and radio off and the noise still occured.

Maybe someone secretly installed a Turbo in the night????

Had my 2pm appointment today at a different dealership, and this tech heard it right away. After a couple minutes poking around, he got pretty close to the root cause, but not quite.

There is a "white plastic bracket" with two wiring harnesses connected. By applying pressure to the bracket mounting points and/or the wires themselves (I'm not sure), he was able to change the pitch and volume of the tone. It's not necessarily that bracket/wire causing the problem since there could be other connected components above. Even with a flashlight, the area is hard to inspect without removing the glove box entirely.

Next Thursday, they'll remove the glove box and get a close look. I'm optimistic that this guy will identify the suspect component then.

BTW, my car is a base sport, so it's not Nav related.

Guys, EVERYONE has this noise. There were many threads about it a few months ago and it seemingly died off as people either 1) got used to it or 2) changed their exhaust which probably drowned it out with the louder exhaust note. The noise was described as a high pitch, electronic sounding whine that is difficult to localize but appears to be coming from the engine bay.

I too frequently hear the noise but fortunately it doesn't bother me as much and has just become a part of the car for me. However, I'd love to hear what's causing it and have it changed if possible.

From the original threads about this, G37 owners claim to hear it as well.

:iagree:

I may have started this thread, if not, another like it. If you raise the hood you will find it appears to come from under the engine cover. When inside the car, the sound emanates from the dash (between you and the engine, duh, lol), makes it hard to totally locate it. As Spearfish states, it goes back to the G37. If you are quiet after you turn off your engine, it will continue for about 3 seconds then die off. I can't hear it when the car is running, so I ignore it now.

John

Yes, I agree, I've learn to ignore it, and my exhaust is louder now too, but it a fix is found, I would sure want to do it. :tup:

I had a horrible high pitch noise coming from my passenger side. Turned out to just be my passenger screaming as I drifted around corners.

:icon18:

High pitched? Must have been one of those babes you share in the gentlemans club :rolleyes:

John

Why would I go cruising with guys? :icon14:

I don't know, you could be at a Z meet, or a track event, or autocross, and one of the guys wants you to demo something in your car ................ but, aside from that.......... bring on the babes :yum:

John

So are you saying its ok to pay $40k for a car that has a high pitch ringing that makes the owner not want to drive it? Sorry but in the specs sheet I did not see 'custom high pitch sound' and I will fight Nissan on this.

Sorry but I choose not to ignore it, it gives me and my wife a splitting headache.

Also this is not on every car, I drove 3 on the dealers lot and not one had this sound.

Well all I can say is you must have a louder pitch than the rest of us have, you can't even hear it on my car when the motor is running.

John

Wow, you guys must have some serious ninja hearing going on, because the only thing i hear is loud music or road noise with the occasional pebble pinging off the inside of the fender hehe :)

(I'm not complaining, if i wanted a quiet ride I would have bought something else)


I tried to listen for it but could not hear it.

Even with the radio on you can hear it, you have to have the radio on loud to mask it. My dad got in the car today for the first time and before we got out of the parking lot he asked 'what is that noise'.

Then you don't have it, this is not a sound you have to listen for. The techs at Nissan hear it as soon as they start to move the car.

I think the sound is coming from inside the engine bay, it sounds like it is emitting from underneath the intake/engine cover.
I had the hood open today and had someone in the car while it was running, when they turned the car off, the sound continued for about 2-3 seconds.
Try it and you'll see what I mean. It's a constant hi-pitched sine wave sound though. I originally thought this was coming from some electrical component behind the dash, now it seams like it is from the engine bay, and I'm just hearing it coming through the dash.

I don't seem to have it either so there are at least two of us without the problem...

:confused:

:iagree:

This is exactly what I have as well, and seems to be the same sound all the
G37 owners were complaining about also. You can't really hear it when the car is running and you're driving, so if this is indeed what he is hearing, he has a much louder version than we do.

John

Put the ignition switch on (without starting the car) and make sure the car is in gear (manual) and you can hear the noise coming from the engine bay. Putting the car into neutral stops it so that should be a hint as to what is causing it.

The sound is so high pitched and loud you have no problem hearing it when you are driving at freeway speeds with the radio on.

Wrong, the sound only happens when the car is under power. As soon as the car stops the sound stops. If your parked and rev the car up you hear the sound. The sound does not change with RPMs, it's either on or off.

It must be two different problems or it acts differently in the automatic.

Whatever is causing your issue is not the same high pitched sound we have all identified then. Ours is faint, coming from under the engine cover, dates back to the G37, fades out when you turn the engine off after about 2 or 3 seconds, and cannot be heard once the car is running.

John

It is totally different, my car makes no noise when the car is stopped, only while under power.

Catching up on the thread. It sounds like there have been other noise complaints in the past, but please don't assume our problem is the same.

I wouldn't say the tone gives me a headache (I get the impression Roo's sound is a bit louder than mine), but it's loud enough to make my ear itch if that makes any sense at all. It's like the ringing in your ears after firing a weapon without ear protection, or coming out of a loud concert. No amount of other sound covers it (engine, radio, etc), but if loud enough the tone is easier to ignore. Anyway, this has all been said before.

I'll have more data Thursday.

Exactly, this is not so much a noise but a ring. Even if you turn the radio up you can still hear the ring since it is a different frequency.

Yep, tried this, and this is exactly what it's doing. It's weird when you put it in neutral it goes away. Maybe something to do with Syncro Rev Match???

I'm going to dealer next tuesday to have them replace a door panel that split, I'll have them look at this as well. :tup:

Ok I've been reading this thread and it sounds like there are some vehicles that have some significant noise coming out of them. I think if the people who have the problem state the exact configuration of their vehicle it would be easier to diagnose what is going on. There isn't enough info in this thread to see a common theme....

Is it possible there is some sort of switching power supply in the vehicle? If you add to the electrical load does it get worse/better? (eg turning on all the lights, high beams dome lights - not the stereo though since that would mask the sound levels).

Don't discount an exhaust leak either. They can make all sorts of weird and crazy sounds including whistling, screaching, etc.

G'Day all from Sydney,Australia::happydance:
I am the proud owner of the all new 370Z,only just arrived in Australia just weeks ago.
Unfortunately,I too have the same high pitched noise that some of you guys are experiencingNOT HAPPY!!...:mad:the bomb I traded didn't cause me a head ache to drive!!!
I can also confirm that the noise is coming from under the glove box.I know it is not the radio,speakers, GPS, air con., mobile (cell) phone:confused:.My Z is auto, right hand drive.Nissan are checking it out tomorrow.Thanks to this site,:tiphat:I know I am not the only one with this prob.Lets hope we can all get it sorted with out too much hassel.:driving:

I have good news. The tech positively identified the sound as coming from the ECU itself. No suprise that the ECU is in the dash behind the glove box.

They have a couple 370's on the lot that could donate an ECU temporarily, but they are 6MT. Unsure if there is any difference in the ECU between 6MT and 7AT, they are playing it safe and ordering a new ECU overnight shipped. I hope to get my 370 back tomorrow, sans high pitched tone.
:werd:

Roo, I'd add that you should be very disappointed in the techs that looked at your car. Doesn't sound like they tried too hard.

I am taking your info 2bits to my dealer and having them do it. I leave Sunday for 3 weeks so I'll leave the car with them and tell them I want it fixed.

Got my car back today, and I consider this issue resolved. The new ECU isn't perfectly silent, but it's good enough. I can hear the sound when the cabin is quiet, but even then it's pretty subtle. The other 99% of the time, I forget about it completely which wasn't possible previously. If I hadn't been so annoyed by the sound over the past couple weeks, I wouldn't be listening for it and probably would never notice.

Good luck Roo and anyone else who get's a bad one. Fortunately, it's an easy fix which only requires removing the glove box and programming the new ECU to work with your existing FOBs.

Nice job figuring this out. + rep

That's great, sounds like there are two different high pitched noises coming from these cars, probably why it has been confusing to isolate. The one from under the engine cover is minimal compared to the discription of the bad ECU.

John

I'm not so sure that the problem is 100% truely solved. It may be that like in my car the noise is a little softer at times and then occasionally gets a little more noticable. If changing the ECM didn't totally resolve the problem it could be something else making the noise. Or all the ECM's are going to make the whine, some just more than others. Replacing could be a gamble, where you'll get a quieter one or maybe even louder.

With that said, I took some time today to try and trace it and it seems to be coming from the back of the car, not under the glove box where the ECM is. With my head under there and with the glove box out it's silent under there. I wonder if it isn't the fuel pump since I've heard a few of those whine over the years. They usually sound a little more mechanical and this noise is more sine wave-ish as someone else here said. If it is electronics related, are there any other electrical components in the back that could be making the noise? And maybe there are two noises happening here, and that's just really sad. I'm going in for service Friday and mentioned that I want them to look into it, though if we don't have answers here, they probably won't either, lol.

If you definitely have a high pitched noise coming from the rear, then there are THREE noises here, as the one coming from under the engine cover has been heard and confirmed by a variety of members, as well as G37 owners.

John

I'm so laughing, though I shouldn't be. What a whiny little Z. Do we know what is making this whine from under the engine cover? :eek:

No one actually has said definitively what it is. I can only hear it when I turn the car off, it continues to do it for a few seconds then dies off. It actually doesn't bother me, as you can't hear it when the cars running. The other two described sounds apparantly can be heard over engine and road noise, according to the members with the problem.

John