I notice a high pitched whine or noise that increases with RPM. It is most apparent when the radio and HVAC are off. I can't tell exactly where it is coming from, but some noise is apparently coming through the speakers.

SO...when I upgraded my front door speakers and dash tweeters the noise got louder. Perhaps the better quality speakers are reproducing the high pitched sound better? Also, the noise gets louder the closer the tweeter crossovers are placed to the dash.

I'm ready to bring it in to the dealer. I've already reinstalled the stock tweeters (noise is still there). Next step is to reinstall the stock door speakers so as not to irritate the warranty police.

Any ideas? Could this be a bad alternator? :(

I notice a high pitched whine or noise that increases with RPM. It is most apparent when the radio and HVAC are off. I can't tell exactly where it is coming from, but some noise is apparently coming through the speakers.

SO...when I upgraded my front door speakers and dash tweeters the noise got louder. Perhaps the better quality speakers are reproducing the high pitched sound better? Also, the noise gets louder the closer the tweeter crossovers are placed to the dash.

I'm ready to bring it in to the dealer. I've already reinstalled the stock tweeters (noise is still there). Next step is to reinstall the stock door speakers so as not to irritate the warranty police.

Any ideas? Could this be a bad alternator? :(
Yes it is the alt. Mine did it at hi rpms until I changed the pulley.

My alt thinks it's a supercharger.

Alt is made by Vortech. lol

lol. Now the question is whether or not the dealer will agree to do anything about it. If not I can't run aftermarket tweeters. I wouldn't think a new car would normally make alternator whine?

The warranty is long enough that if anything goes wrong it'll get replaced.

That's true, once I get beyond "that's normal" and "they all sound that way" :gr_jest:.

It seems to come from under the hood as well. So, there is some noise through the speakers (mainly tweeters) and some from under the hood. Hard to tell though when I'm trying to steer :cool:

Option: Turn radio off, install pulley and exhaust and listen to people whine instead of your alt.:)

Mine whines for 15-20 seconds after shut off. Sounds like some transformer or something electrical that is charged.

one thing i've discovered about the g8 in over a month's worth of ownership...it sure creates alot of high pitched noises! something under the hood (probably alt) gives off a high pitch noise at cold startup and lasts for about 15 seconds.

just recently i began noticing that when i accelerate i hear a high pitched noise that goes up and down in tune with the engine rpms, but i don't think it's coming through the stereo speakers.

at 65-70 mph or higher while cruising on the highway there is a very audible high pitched noise that seems to be coming from the 6th ratio in the tranny.

are aussie holden engineers not able to hear high pitched tones?? i've never had a vehicle that produced so many of them! :)

i'm sorta glad that i leased this car because if i had bought it, these irritations would have really started to grate on me...

Mine whines for 15-20 seconds after shut off. Sounds like some transformer or something electrical that is charged.

mine does that too...

mine does that too...

As does mine...it's probably the OnStar "monitoring" system shutting down, just like when they bugged the phones in all those old movies.

am sick of whines/noise and it really increased after I installed amplifire ( kenwood 450 ) and changed all door speackers ( alpine 300w ) and added more two speackers @ the back. I also got Magnaflow cat-back but still the noisy/whines is there and it changes the interior good sound of MF cat-back

As does mine...it's probably the OnStar "monitoring" system shutting down, just like when they bugged the phones in all those old movies.

It has nothing to do with Onstar, Sat Nav or anything else for that matter, it is simple, it is alternator whine induced into the the HIFI system at the rear amp in the boot and the main power feed to the headunit.

I have the Holden Caprice (Bose System installed), and the wiring is the same for the power from the battery to the front of the car as it is in the VE, G8 or whatever.

Fix is easy, ferrite cores around the power wires to the amp and head unit solves the problem, the whine is coming from the left front channel mainly, put a few clamp round ferrites around the power cables at each end and presto, whine gone, if you want to sort it all out totally, place them around the speaker cables at the sills where the speaker wires leave the main body of the car and head into the doors, thats what i did...... All fixed.

It has nothing to do with Onstar, Sat Nav or anything else for that matter, it is simple, it is alternator whine induced into the the HIFI system at the rear amp in the boot and the main power feed to the headunit.

I have the Holden Caprice (Bose System installed), and the wiring is the same for the power from the battery to the front of the car as it is in the VE, G8 or whatever.

Fix is easy, ferrite cores around the power wires to the amp and head unit solves the problem, the whine is coming from the left front channel mainly, put a few clamp round ferrites around the power cables at each end and presto, whine gone, if you want to sort it all out totally, place them around the speaker cables at the sills where the speaker wires leave the main body of the car and head into the doors, thats what i did...... All fixed.

Thanks for the great advice. I'll give it a try! :aus_flag:

One question Slimbo...any advice on accessing the power cable going to the head unit? Does the head unit have to be removed? Or can you access from under the dash?

I guess I'll do some searcing on head unit removal just in case...

question i have is why in the heck is electrical feedback getting into the sound system in the first place. i can't remember the last time i experienced this problem on a car!

I'm just guess, but it may be the location of the battery. Power has to go a long way. I suspect Radio Shack has something to fix it though.

One question Slimbo...any advice on accessing the power cable going to the head unit? Does the head unit have to be removed? Or can you access from under the dash?

I guess I'll do some searcing on head unit removal just in case...

For the headunit, I unwrapped the black covering on the loom on the right side of the head unit, no need to remove the unit from the car, all can be accessed from the right hand side, removing the trim on the side of the console and the plastic dash section above it, i'm sure if you search here you'll see how it is done.

Did the same on the amp in the boot as well, although the Bose unit is nothing like the standard head unit and amp, the principal is the same.

question i have is why in the heck is electrical feedback getting into the sound system in the first place. i can't remember the last time i experienced this problem on a car!

Two reasons this happens,

1/ GM do everything on the cheap and i mean the cheap, if they can save .05 cents, they will.

2/ Audio wiring loom is on the same side as the Battery cable to the front of the car, especially in the boot and around the back amplifier and back seat, noise is injected there.

As yet, on either of our G8's. But i can remember back in the day when this WAS an issue and they started installing filter capacitors on the alternators to arrest the feedback.

Seems as though i remember seeing something somewhere recently about inline filters in vehicle wiring for this purpose as well...Sorry guys but sometimes these senior moments really suck! :whine:

I'm sure they are still in use somewhere if not on the alternator and would suspect that a GM supplier dropped the ball somehow and a bad batch made it to the assembly line.

If someone has connections with a local alternator re-builder they could probably shed more light into this as the dealers are usually clueless at first when Sh%t happens! LOL!

Cheers!

For the headunit, I unwrapped the black covering on the loom on the right side of the head unit, no need to remove the unit from the car, all can be accessed from the right hand side, removing the trim on the side of the console and the plastic dash section above it, i'm sure if you search here you'll see how it is done.

Did the same on the amp in the boot as well, although the Bose unit is nothing like the standard head unit and amp, the principal is the same.

I popped the right side panel off this morning and took a look. I only had a few minutes before work and didn't want to get on my back in the company parking lot. I'll have to take a closer look tomorrow. There are a bunch of wires back there!

Man I'm glad to hear others are hearing the same noise as me. my whine happens only between 70-80 mph. I posted this problem a few months ago, but nobody seemed to know what I was talking about. I guess their are more owners now.

So alternator is the culprit???

Been wanting to take it in but havent had time. but the noise is QUITE irritating!!

Black G8 V8

good news is that I got 24 MPG on my recent trip. Average speed 82.

Mine has a whistle/whine that appears to be coming from the engine compartment. It's there from startup to shutdown. Sounds like electrical noise inside the car. Almost like a vac leak outside. Haven't pinned it down yet.

Man I'm glad to hear others are hearing the same noise as me. my whine happens only between 70-80 mph. I posted this problem a few months ago, but nobody seemed to know what I was talking about. I guess their are more owners now.

So alternator is the culprit???

Been wanting to take it in but havent had time. but the noise is QUITE irritating!!

Black G8 V8

good news is that I got 24 MPG on my recent trip. Average speed 82.

i have the same thing around 70mph or higher. however if i shift out of 6th gear manually, the noise immediately goes away. so i'm not completely sure if its something in the powertrain (gear whine) or with the alternator. maybe there is a certain rpm range where the alternator gives off this noise...?

So I installed a couple of snap-together ferrite cores around the power supply wires going to the front and rear amps. I used the wiring diagrams here:
http://www.g8board.com/forums/showthread.php?t=2087&highlight=wiring+diagram

I installed one core around the three orange/blue power wires up front, and one core around the two orange/white power wires in back.

The verdict is....no change! I'm still getting the same whine. Perhaps I need more than one ferrite core? I'm thinking its finally time for a trip to the dealer!

let us all know how you turn out....

So I installed a couple of snap-together ferrite cores around the power supply wires going to the front and rear amps. I used the wiring diagrams here:
http://www.g8board.com/forums/showthread.php?t=2087&highlight=wiring+diagram

I installed one core around the three orange/blue power wires up front, and one core around the two orange/white power wires in back.

The verdict is....no change! I'm still getting the same whine. Perhaps I need more than one ferrite core? I'm thinking its finally time for a trip to the dealer!

One thing i did forget to mention, check on the back of the alternator for a cap as well, if it isn't there then add one, how do i explain it, it should be about approx .5uF have a single wire out of the centre of the cap and the body of the cap has what looks like a spade terminal on it, the spade terminal (Case of cap) is earth, and the wire (normally blue) is positve, bold the earth side to one of the alternator earth or monting bolts and the wire side of the the cap will go to the alternator positive output (too battery in boot), if the ferrites didn't fix it, which it did in mine then the cap on the alternator should, I have two ferrites at each end of the wiring.

One thing i did forget to mention, check on the back of the alternator for a cap as well, if it isn't there then add one, how do i explain it, it should be about approx .5uF have a single wire out of the centre of the cap and the body of the cap has what looks like a spade terminal on it, the spade terminal (Case of cap) is earth, and the wire (normally blue) is positve, bold the earth side to one of the alternator earth or monting bolts and the wire side of the the cap will go to the alternator positive output (too battery in boot), if the ferrites didn't fix it, which it did in mine then the cap on the alternator should, I have two ferrites at each end of the wiring.

OK, I'll try the second set of ferrites first. Then ask the dealer to look at it before adding the cap. I can always add the cap afterwards. Don't want to risk them "voiding" my alternator warranty :judge:

I think the ferrites should be around the speaker wires rather than the power cables since they are the ones conducting the noise? I'm placing them around the 18 gage wires from the amp plug in the boot (except the (2) black and orange wires which are power) to see if that helps.

[QUOTE]So I installed a couple of snap-together ferrite cores around the power supply wires going to the front and rear amps. I used the wiring diagrams here:
http://www.g8board.com/forums/showthread.php?t=2087&highlight=wiring+diagram[QUOTE]

Where did you get the ferriets Dak? Radio Shack?

I think the ferrites should be around the speaker wires rather than the power cables since they are the ones conducting the noise? I'm placing them around the 18 gage wires from the amp plug in the boot (except the (2) black and orange wires which are power) to see if that helps.

[QUOTE]So I installed a couple of snap-together ferrite cores around the power supply wires going to the front and rear amps. I used the wiring diagrams here:
http://www.g8board.com/forums/showthread.php?t=2087&highlight=wiring+diagram[QUOTE]

Where did you get the ferriets Dak? Radio Shack?

Wow, sorry for the late response. I got them at Radio Shack.

I've procrastinating. My next step is to take it in to the dealer. It's a hassle, but the warranty should cover it.

I notice a high pitched whine or noise that increases with RPM. It is most apparent when the radio and HVAC are off. I can't tell exactly where it is coming from, but some noise is apparently coming through the speakers.

SO...when I upgraded my front door speakers and dash tweeters the noise got louder. Perhaps the better quality speakers are reproducing the high pitched sound better? Also, the noise gets louder the closer the tweeter crossovers are placed to the dash.

I'm ready to bring it in to the dealer. I've already reinstalled the stock tweeters (noise is still there). Next step is to reinstall the stock door speakers so as not to irritate the warranty police.

Any ideas? Could this be a bad alternator? :(
Shoulda' got a MGM. Quiet as a churchmouse at all speeds. The G8 is lots quieter than my Bonneville. FWD vs RWD I recon. Lots less roadnoise too. :)

The other day I was driving in a parking garage and really heard my car whistling/whining just like many of you have described in this post. The whine seems louder upon cold starts and also seems to diminish a bit once the car is completely warmed up. To me, it actually sounds more like a whistle than a whine. Anyway, it's starting to get under my skin . ..

My first guess was the alternator, but you can hear it even when the radio is off. Does that make sense?

I also wondered if it's the idle air control valve . . .would make sense that it becomes a little quieter as the car warms up.

did any of you find a solution for this noise?

If you place some ferite cores on the speaker wires behind the deck, it should stop the noise. This is also the GM fix, radio shack sells them for like 2 bucks.

The other day I was driving in a parking garage and really heard my car whistling/whining just like many of you have described in this post. The whine seems louder upon cold starts and also seems to diminish a bit once the car is completely warmed up. To me, it actually sounds more like a whistle than a whine. Anyway, it's starting to get under my skin . ..

My first guess was the alternator, but you can hear it even when the radio is off. Does that make sense?

I also wondered if it's the idle air control valve . . .would make sense that it becomes a little quieter as the car warms up.

did any of you find a solution for this noise?


The amps are apparently on even when the radio is turned off. I know this because I am getting whine out of the front speakers even with the radio off. It was much worse with aftermarket tweeters in the dash. I've procrastinated and have not yet brought the car in to the dealer. I've been saving up the list of issues: 1.) TCM/ECM update, 2.) suspension rattle, and 3.) the "alternator" whine. Not too bad for a new car. All in all I'm very pleased.

The amps are apparently on even when the radio is turned off. I know this because I am getting whine out of the front speakers even with the radio off. It was much worse with aftermarket tweeters in the dash. I've procrastinated and have not yet brought the car in to the dealer. I've been saving up the list of issues: 1.) TCM/ECM update, 2.) suspension rattle, and 3.) the "alternator" whine. Not too bad for a new car. All in all I'm very pleased.

Curious. . .I also have a suspension rattle. It's not super-obvious, but when I'm not on the brakes and moving straight over say, a rumble strip, the front left suspension makes a rattling sound. I figure something must be loose up front. I also need to take it to the dealer for them to look at this. Would you also describe your suspension rattle like this?

per the alternator whine...i recently take a long trip and i've noticed that upon cold start the whine is much less noticeable. the whine "loudness" seems to be in relation to how low the battery charge is....? at least that's what i've noticed...

I did some additional testing this morning. Upon the first start of the day (stone cold), the car starts and for the first second, there is no whine. Then you hear something sort of "kick on" and the daytime running lights brighten. Of note, it is definitely not the ac compressor kicking on (it was off.) The whine/whistling is coming from the driver side of the motor, and now I'm also not convinced it's radiating through the radio system because you can hear it pretty clearly outside the car.

I think it's just a really loud alternator now - probably nothing wrong with it but I'll probably have the dealership take a quick look to makes sure it's fine.
Also, as I said before, the noise seems to be quieter/nonexistant after a long drive (fully charged system?)

I've noticed the same thing, but only recently now that the weather has gotten colder. It's on a cold start, and I think it goes away once the car warms up.

I've had other GM cars that had the same whistle/whine, and my brain seems to associate it with cold weather, for some reason.

Problem sorted all together, took a while, and a few changes as well.


http://www.ls1.com.au/forum/showthread.php?t=106781

Problem sorted all together, took a while, and a few changes as well.


http://www.ls1.com.au/forum/showthread.php?t=106781

Thanks for the post Slimbo! I'm running a simple set of replacement tweeters on the dash. I think you are saying that the only way to get rid of the whine is to run the crossovers to the boot? That seems like a long way to run the cabling from the dash, especially without the use of an external amp. Isn't there some other way? Perhaps wrapping the crossovers in lead shielding?

I do notice that the whine is very dependent on the positioning of the crossovers and wires. Placing them in the kick panel area is definitely out of the question. Were you not happy with the placement next to the front seats?

Curious. . .I also have a suspension rattle. It's not super-obvious, but when I'm not on the brakes and moving straight over say, a rumble strip, the front left suspension makes a rattling sound. I figure something must be loose up front. I also need to take it to the dealer for them to look at this. Would you also describe your suspension rattle like this?

Yes, exactly like that except mine is on the passenger side.

Thanks for the post Slimbo! I'm running a simple set of replacement tweeters on the dash. I think you are saying that the only way to get rid of the whine is to run the crossovers to the boot? That seems like a long way to run the cabling from the dash, especially without the use of an external amp. Isn't there some other way? Perhaps wrapping the crossovers in lead shielding?

I do notice that the whine is very dependent on the positioning of the crossovers and wires. Placing them in the kick panel area is definitely out of the question. Were you not happy with the placement next to the front seats?

I have tried sheilding everything, didn't work, the problem is the inductors in the crossover network, this is where the noise is being introduced, keeping all wiring away from the power cables does help, wiring the new tweeter and woofer wires along the original loom also helps, but the biggest gain is from keeping the crossover network away from everything else.

One advantage to see if you have it right is, you don't need the car actually running, just turn the key to accessories, my wifes car although it is a VE Calais International, with DVD in the roof was a lot easier to cure than my Caprice, my car has the screens in the headrest's and there is a power feed for them beside the seats where i put the wife's crossovers, couldn't do it it mine for that reason above.

Once I placed the crossover networks in my boot, problem solved, length of the tweeter wiring had no effect on the overall sound of the system, both of our cars have the original centre speakers installed as well, these were not removed.

I see a lot of posts about the poor quality of the original head unit, the head unit isn't actually too bad, the problem is the crap $2.00 speakers GM use, even in my Caprice Bose System, which actually isn't Bose, the biggest gain for these systems is to Dynamat the rear end of the car completely, and change the original Chinese made speakers to something a little better, my wifes car has Pioneer splits in the front and Pioneer 4 way's in the rear doors, all tone and EQ settings are default and all i did was add a little gain to the boot amp, here system sounds brilliant, even coming from me who's prvious car had around AUD$18.000.00 of pure class A Pioneer ODR equipment.

Mine and my wifes sound system now actually sound very well balanced, also Volume levels used to distort at between 22-24, she can now crank the system to plus 50 with no distortion at all.

Wow, thanks for your help on this. The Infinity door speakers that I still have in there have some sort of crossover network that is probably adding to the noise. I'll have to take them out and see if they part of the problem. Separating their crossover might be more difficult because is it wired directly to the speaker chassis. If so I might be better off with separates. What a pain!

Any updates on the noise?

No, still procrastinating about the trip to the dealer. The current list:

1. alternator whine
2. cold engine piston noise (aka piston slap)
3. suspension rattle
4. tire pressure sensors inaccurate readings
5. ECM/TCM update

I need to make an appointment to see the dealer ASAP. Thanks for the reminder!

No, still procrastinating about the trip to the dealer. The current list:

1. alternator whine
2. cold engine piston noise (aka piston slap)
3. suspension rattle
4. tire pressure sensors inaccurate readings
5. ECM/TCM update

I need to make an appointment to see the dealer ASAP. Thanks for the reminder!


Took the car in today. The tech said the whine is "normal" and "all the G8s" do it. I asked the service adviser how the tech got to be an expert on the topic without calling GM. He said the tech has heard many G8s an they all do it. Sounds like the dealer will be no help.

Next step is to put the factory speakers back in and see what happens. This is BS.

I think it's about time to do a mass e-mail or something to Pontiac. Why is this the only alternator they have that makes noise?
Anybody know who makes the silly thing anyway?

Agreed.

Glad I am not the only one....I thought I was in my old 76 Ford again.

I noticed the alternator -speaker induced whine the day after we picked up our new 09 GT. I cannot believe we have to go through the line filtering patches on an OEM vehicle. And GM wonders why it is in a hole.

I had the same issue on my '81 Buick Skylark beater high school car with my Radio Shack Optimus power equalizer amp! I had to get a line filter to remove the "audible tachometer" that I now have again.

My car is going in for this on Monday along with sunroof creaking over any bump and doors that are not smooth to open, and steering wheel vibration. (I fixed the "clock-radio bass level" issue by turning up the sub amp gain - thanks to this board!)

So has anyone had this fixed by their dealer yet?

---slimbo---
Thanks for the help. FYI - I was in Burnie, Tasmania for three weeks back in March of 2007 for work and I first saw the Car of the Year Holden Commodore V8 there which obviously is our US G8 now. The turbo Falcon looked pretty interesting too. I am sure I can find the car pics from that trip...


Thanks.

<snip>

Fix is easy, ferrite cores around the power wires to the amp and head unit solves the problem, the whine is coming from the left front channel mainly, put a few clamp round ferrites around the power cables at each end and presto, whine gone, if you want to sort it all out totally, place them around the speaker cables at the sills where the speaker wires leave the main body of the car and head into the doors, thats what i did...... All fixed.

Can you elaborate on these locations? Any pictures of what you used and placement?

Thanks.

Also, what color are the subject power wires?

i have the same thing around 70mph or higher. however if i shift out of 6th gear manually, the noise immediately goes away. so i'm not completely sure if its something in the powertrain (gear whine) or with the alternator. maybe there is a certain rpm range where the alternator gives off this noise...?

Mine has the same whine at high speeds... I believe other members have said the cruising at high speeds whine is the transmission. Per other posts, there is a service bulletin on this, and it sounds like it is easily fixed.

I also have the alternator whine that coincides with engine RPM, but it is mostly apparent when I'm using OnStar, and that is definitely coming from the speakers.

Last night while on my drive home from work, the wife calls me on the OnStar and when the radio mutes the XM for the call (voice), I hear the loud whine and it would change pitch with engine rpm.

When I got home and shut off the car it went completely dead. So dead infact that I could not even get the key out of the ignition. I checked the battery voltage and it was Zero. It's at the shop now.

Figured I would put this here without starting a new topic.

On my GXP, I cannot use the Onstar or the Bluetooth due to low volume and a horrid whine. It is going to the dealer monday.

Separate but maybe related, On acceleration, over 4000 Rpms, I here a loud whine outside of the vehicle. I mean it screams like a banshee, this is at higher rpm's. Anyone have this?

Why does every thread regarding these issues seem to die without a solution?

I am experiencing whine consistent with the RPMs with the radio off. However, if I switch off the HVAC system as well, the whine disappears. This issue is, of course, completely separate from the not-so-annoying noise the alternator physically creates in the engine compartment.

If I had to guess, I would think something drastic such as cracking open the head unit and putting ferrite "donuts" between any power connections shared by the radio and HVAC might be in order. If the units are even connected to each other, that is.

Threads like this one seem promising, but I haven't yet found one that delivers. Does anyone have a solution? Help!

2009 G8 GT (Stock Everything)

If anyone asks just tell them its supercharged.


I used to notice mine making similar whining noises, but post cam/exhaust I can't hear it anymore.

Dammit... my car has the same exact issue and I have only 100 miles left on my warranty!
I am not certain my whine/supercharger noise comes from the speaker and it might be more a transmission noise. Like somebody before me said, it is more apparent at speeds of 70 mph and higher.

It is certainly alternator whine. On cold mornings or after I have depleted my battery more than usual it is so pronounced that my meighbors hear it as I drive out of my driveway. It is not speakers it is coming from under the hood. I can actually heaer it reflecting off of my fence as I drive out of my driveway. When your alternator is under load it occurs.
As an experiment burn down your battery (engine off) untill battery saver mode comes on and start the engine and see if the sound isn't noticeably pronounced.

:gears:

Just thought I'd let you know what I found regarding a whine or squeal i was having when the RPM's hit 1,100 and was traveling about 40 to 45 MPH. I took the car in three times for this problem before I finally fixed it myself. The first time, the service tech heard the noise but the technician didn't think it was anything. The second time he told me that he would have to change the belts, which did not fix the problem. After talking to the service rep and finding out that the alternator is not covered past the 5 year B2B warranty I decided to work on it myself. I placed a Delrin rod on the pulley of the power steering pump since this is the area that the sound appeared to be coming from. Pushing on the pulley had no affect on the squeek, turned into a squeal at higher RPM's, so I moved down to the alternator. When I pushed on the alternator pulley the noise went away. I changed the alternator and the problem is gone. I also had a whine in the radio but I don't know if that is gone or not. I will check tonight on my way home. Hope this helps someone out there. BTW. the alternator is hard to find.

Thanks for the note, Fluidbob. My 2008 G8 GT has 127,000 miles on the clock and the whine is bad...and has gotten worse. Now, the sqeal/whine gets MUCH worse when I connect my Droid or ipod to the aux cable, and then plug the device in, to charge it when listening to music. The noise is so bad that I never charge and play at the same time.

I'm thinking that it is worse because the alternator is wearing, having so many miles on it.

Did you get your alternator from the dealer, or aftermarket?

Alternator whine is usually caused by the diode pack in the atl. going bad. A local alt. rebuilder can diagnose it. If it needs a rebuild they can often use a better part, more amp doide pack, to prevent future problems. I suggest keeping your original if its an option.

@QuicksilberG8, I can understand how frustrating this can be with your vehicle. If you choose to purchase the part from the dealership without being installed by them, you would get a 12 month warranty on the part. This warranty would start from the date that the part was purchased.

Michelle, GM Customer Service

Just thought I'd let you know....I also had a whine in the radio but I don't know if that is gone or not. I will check tonight on my way home. Hope this helps someone out there. BTW. the alternator is hard to find.

Update?

Possibly made a big break through in my own problem, might help others as well. I noticed that I was only hearing the noise coming through the right front speaker. Confirmed by disconnecting that speaker at the amp, and with the remaining 3 still plugged in, I was able to rev the engine through the full rpm range with ZERO alternator noise.

Got me to thinking, the connections when swapping the stock speakers for the db651's weren't the best I've ever seen. Could a loose connection at the terminals be causing the whine? Does everyone who is experiencing alt whine have upgraded door speakers and can they isolate it to one or two specific speakers?

Or could this be the result of running the wires for the amp to head unit in close proximity to the right front door speaker wiring? If everyone was experiencing the whine from just the right front speaker this may be more likely if, like me, they all ran their wires down the passenger side under the door sills.

I'll mess with my rf speaker more when it gets warmer. It's frigid cold outside still and I don't have a warm place to work on my car.

I had the whine for the longest time until I finally got tired of telling people that my car sounds like it is supercharged.
It turns out that I did not wire the front door and dash speakers correctly. I added component speakers to the front and replaced the dash tweeters and front door speakers. The kit came with a crossover. It turns out that I hooked up the crossover's input using the wires that were between the door and the dash speakers. That caused some kind of loop feedback. Once I connected the crossover directly to the amp (head unit) then from the crossover to the door and dash... NO MORE WHINE!!!
I looked everywhere for the solution and it was just me being lazy the first time I wired it up. I figured that I could use the wires from the door then to the crossover then to the tweeters (and the tweeters would only have the higher frequencies). That was the incorrect answer.
Hope that helps you intmd8ak. It probably is not the wiring in too close of proximity or a loose connection. It is probably not wired correctly. Mine sounded great with some volume, but I had the whine until I ran the wires correctly.