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Pontiac Grand Prix Rattles, Clunks and other odd Noises

ocmike3ocmike3 Posts: 232
I can say from the few road trips I have taken in my 2005 Dark Cherry GXP (Our 5 year old calls it purple) I believe GM's mileage estimates. I've gotten ~ 27mpg on the hwy. Around town, commuting has been 15-18mpg. (Its worse now as the metro area makes the stations serve up gas w/10% ethanol Nov - March - my mileage has typically dropped 10%+) Heavy foot = very bad mileage; but still much better than my 68 Dodge(383 HO) got way back when.

As for the hum, I don't know if I have it. I can't hear anything that registers as odd with the car on/off. I have had a slight hearing lost since High School, but not bad enough to need correction. Maybe I got lucky? I do have the Monsoon stereo...


  • tlaurotlauro Posts: 504
    the hum/hiss that's being tossed around isn't a big deal. IMO, it's being blown out of proportion given it's only there once you open the car up and sit in it. it's gone once the car is started.

    so it's not like you're listening to mello music with a hiss or hum in the background. not unless you've upgraded to an aftermarket amp for the stock stereo and used some cheap gain controls or RCA converters. I've heard systems like that and can't figure why folks don't just use the good stuff.
  • "the hum/hiss that's being tossed around isn't a big deal. IMO, it's being blown out of proportion given it's only there once you open the car up and sit in it. it's gone once the car is started.

    so it's not like you're listening to mello music with a hiss or hum in the background. not unless you've upgraded to an aftermarket amp for the stock stereo and used some cheap gain controls or RCA converters. I've heard systems like that and can't figure why folks don't just use the good stuff."

    Speak for yourself. :) I'm glad to hear that not everyone has the same problem, but mine is NOT gone when the car is started, and I definitely have a hum while listening to mellow music. No upgrades here, either. Everything stock.

    My only solution so far is to always have the radio on with music of the non-mellow variety... :)
  • tlaurotlauro Posts: 504
    then I would say you definitely have some interference somewhere and would have the dealer compare it to another GXP without the noise and go from there.....if the dealer absolutely can't fix it I would push the issue and have them contract with a good stereo shop to fix it.

    "Speak for yourself. I'm glad to hear that not everyone has the same problem, but mine is NOT gone when the car is started, and I definitely have a hum while listening to mellow music. No upgrades here, either. Everything stock. "
  • chats1chats1 Posts: 158
    Tlauro: Easier said than done. Maybe you aren't as fussy with your car as other people are. In the Northeast I think our cars cost more than in Ohio. Now, first of all, the dealers aren't going to contract with a "good stereo shop to fix it." They would do the work at the dealership and if you take it on your own, it is not covered by the warranty. Anyway it's not the dealer's problem; it's GM's problem, and their reply is "It is not harmful, there is no remedy at this time so it doesn't get fixed." Well, my reply is "No more GM cars after having bought five." I just received a notice from GM that they will be sending me a report to fill out, signed by some VP in charge of marketing and advertising so I will really tell them exactly how I feel about this. Just because they put the piece of "junk" in the 2005's; the piece of junk should not have been put in the 2006 when they were aware of the problematic speaker system. My recourse -- no more GM cars. And let me re-emphasize this is not being blown out of proportion. Just because it doesn't bother you, it bothers other people, like me. I guess you just aren't too fussy with your cars!!
  • rmozolrmozol Posts: 124
    You might want to give the BBB a try. It's pretty easy, and they do all the leg work. I've been dealing with them over an Infiniti issue (which is why I'm dumping it next month), and they have gotten a LOT done because of their name. You can do it online which makes it even easier.
  • cen19cen19 Posts: 1
    Have been driving my '05 Grand Prix GTP for just a few days and I also have the hissing sound coming from the speakers. It's the Monsoon system. Otherwise the car is great.. so far, but the noise from the speakers is annoying.
  • tlaurotlauro Posts: 504
    Look, if the hiss that lasts for say 20-30 second when you open your door bothers you that much, then I don't know what to say. I hear it, but mine stops after no more than one minute. It also stops is isn't present when my car is running. Like I said before, if you still hear it when the car is running, take it up with the dealer and compare with other cars. If not, then IMO, you are blowing it out of proportion, but then it's your car.

    Fussy...yes, actually I am. But the his goes away once I start it up so it's a non-issue for me.
  • chats1chats1 Posts: 158
    First of all, as I said before, it is not a dealer issue, it is a GM issue. They put the piece of junk in the 2005 GXP, were aware of it, and put it in the 2006 GXP anyway. My car wasn't a used car, a demo, but "Brand New." So, I don't expect to purchase a mew car with a problematic speaker system that GM was well aware of with the 2005 model and they just stuck it in the 2006 model to get rid of them, I assume. The dealer fully agrees with me. They checked the bulletins -- still no remedy. Another thing, I am more than fussy with my car, I am a fanatic. Who has their car washed two or three times a week -- I do. Also, when I trade in my cars after three years, they are not in excellent condition, they are all in "Superb" condition -- they look like they just came out of a showroom!!! The humming/hissing bothers me. It shouldn't be there, and I am not giving up on this.
  • mrmedoesmrmedoes Posts: 3
    My car is one of the ones that has the hissing that goes on the entire time that the car is running. I notice that some of you say that it goes away after you start moving or that you don't have it at all (that you notice). Well I listen to a lot of sports talk and such, and I notice every bit of it, so I was wondering if anyone had found a solution, even if it's just a way to get it to the point that it goes away while I drive. Sometimes I like to drive with the radio off and listen to the engine too, so this could be a major problem.

    The worst part is that I have bad hearing in one ear and still can hear it. I don't know if it's the tone that it's at or what, but it's making a good car a lot worse for me.

    If no one has any solutions that have worked for them, do you at least know who to contact at Pontiac/GM? It seems like the dealer is only so much and that this really should be a recall type issue. I have some contacts, but figured that one of you may have already started down the path.

    Thanks for your help. -Mike
  • rmozolrmozol Posts: 124
    In that extra booklet we got, it has a "chain of command" for problems. It's something like the delaer, then Pontiac customer service, then BBB, etc. I'd go to the dealer, tell them to hear it, ask what THEY will do. Then just politely tell them that this really bothers you, and you'll be contacting customer service next, until it gets resolved. They should be understanding and do what it will take to fix it. This is how recalls/service bulletins are discovered by the consumers talking, so don't feel bad. I'm just happy becuase we'll be getting snow tomorrow so I can see what it drives like before I order any snow tires and extra wheels!
  • chats1chats1 Posts: 158
    The dealer cannot do anything because there are no bulletins at this time for remedying this problem. The CAC is worthless; they just want to get rid of problems; they don't solve them. The BBB I didn't even bother with. I figured it was a waste of my time. Try writing to Mark LaNeve, Vice President, GM North America, Vehicle Sales, Service and Marketing, P.O. Box 10074, Toledo, OH 43682-4183. Also, I wouldn't complete any questionnaires or surveys that they will send you until they fix the problem. On my surveys, I wrote that this will be completed when the hissing/humming sound is remedied and I also told them "no more GM cars for me; you were aware of the problem with the 2005 GXP and yet put the piece of junk in the 2006 GXP.
  • pfwizpfwiz Posts: 6
    After 1300 mile on my new GXP I have never heard the "hissing". Also just to mention it my transmission works fine. Actually I have no problems at all mechanically with car. That is not to say I don't have a few issues with it, though.
    1) Why doesn't a car with a $34K sticker have built a built in garage door opener? My last 3 cars have had it. I had to go out and buy a remote....
    2) I worked in the GM Oshawa car plant (where Grad Prixs are built) they require everyone to wear cut proof sleeves and gloves when handling the metal the body pieces are made of because they can be razor sharp. This said why is there access inside the trunk (opposite the trunk lock) where you can reach your hand in and touch this razor sharp metal? They want to protect the workers, but the customers are on there own?
    3) I am still disappointed by the Nav system. As I said earlier my $600 Garmin Streetpilot does a much better job navigating all the way down to the smallest residential streets.
    4) Why doesn't the DoD have some kind of light telling you when it is running on 4 cyclinders? I told my wife I am not sure we really have DoD, maybe we just have a decal on the engine...
    Don't get the wrong idea, I like my GXP. I just wonder what GM was thinking when they made some of these choices.

    P.S. Just for fun try putting the tranny in manual and in first gear, at about 25 mph goose the throttle hard. I think I got whiplash!
  • dblducedblduce Posts: 58
    Im a proud owner of a 2005 GXP. I bought it in June 05, and have loved it ever since. I have not noticed the hissing issue that some have. I guess im lucky, because i am VERY particular about a car that has quirks like that. That would bother me until it was fixed. Having been an owner of 2 grand prix GTP's I can say that i finally found a car that doesnt make me feel jealous of other people's vehicles :). When i would be in my GTP, sometimes id see a mustang cobra or camaro SS and get a little jealous thinking that they had a superior car. But now having the V8, i can honestly say that i have yet to see another vehicle on the road that i would rather own! I love everything about my GXP, having almost 6,500 miles on it. I love every trip i make in it! As for the DoD system, i think it works like a charm. To really appreciate how it works, get on a long stretch of highway, and put the computer display on "instant miles per gallon". you can really tell when the DoD turns on because the mpg goes from the high teens, to over 30 or more! The other thing i love about this car is that I still have yet to see a lot of other ones, if any on the road, at least where i live. I saw 1 other not long after i bought mine, but havent seen any others since. I like the fact that Im driving a vehicle that not many have seen before :)
  • All,
    Picked up my new 06 GXP Saturday and when I was putting some things in the glove box, I heard the hum you all have talked about. When the car is on the hum stops and I seem to hear the radio clear. Will check when I get back from my trip. Waiting to actually drive the thing. Picked it up Saturday and go out of town Sunday am till Thursday. Will let you know on the hum though.

    Anxiously waiting to get back to Fort Worth to drive it.

  • dingo9tndingo9tn Posts: 4
    i got my GXP 1 month ago. i hear the hissing also.i hear it when the car is running also, even on long trips. GM Canada is looking into it for me, and the dealer says there is no fix at this time. i hope they find a fix soon. :P
  • dakota74dakota74 Posts: 2
    Does anyone else experience this? I have a 06 GXP and the one thing I have a real problem with is this. My mother in law has the 04 GTP and her sunroo fhas the wind deflector that pops up once you open the roof -- and there's little to no noise.

    In mine, there's no deflector, and you can hardly hear the radio and forget about a cell phone while the roof is open!!! Even in Vent mode, the roof is just so loud with wind!!

    Anyone? Thanks!
  • No help from me. I have NO sunroof (and love it that way) in my GXP.
  • ocmike3ocmike3 Posts: 232
    One of my previous 2004 GTP had the small deflector(it was quite trick) and my 2005 GXP does not. I am not a sunroof fan, only have one because it came on the cars... If I ever order another new car, I wouldn't get one.(always buy existing inventory, but did factory order a new El Camino way back in '82)
    Some folks love them, I like air, but not the noise/wind buffeting in a car. If I want the feel of wind, I'll jump on a motorbike.
  • Sunroofs are great! Especially in the summer when its 200 degrees in the car, and you open the vent for a short while. I have the 2005 bonneville gxp, and it does have the deflector. I'd check with the dealer parts department, (in person) and see if the bonneville/grandprix are the same sunroof. Maybe the deflector could be added.
  • rayainswrayainsw Posts: 3,017
    “Even in Vent mode, the roof is just so loud with wind!!”

    I find that when in ‘vent’ position, if I then just tap the sunroof switch in the “close” direction (perhaps closing \ lowering rear edge of the roof a quarter inch or so) this reduces the wind noise by a very large amount, retaining the flow through fresh air – but making the noise level a non-issue for me, at least up to 80 mph or so . . . I run mine in this position nearly all winter.

    I almost never open the roof all the way – except when stuck in slow traffic \ stopped in heavy traffic.

    - Ray
    Addicted to fresh air . .
    2016 BMW 340i
  • dblducedblduce Posts: 58
    I barely notice my sunroof when its in 'vent' mode. My last vehicle was a 2003 Grand Prix GTP, and one thing i liked about its sunroof was the vent holes in the moon roof that slides back into the headliner. that meant you didnt have to slide it back first before opening the sunroof.

    Took my 2005 GXP on a road trip yesterday, roughly 400 miles round trip. once i got on the main highway (interstate 80), i reset my AVG mpg reading, and let it go from there. when i got to where i was going it was around 26.8 mpg, and i reset it again when i left for home. again, it was around 26.7 mpg when i got home. I had the cruise set for 68-70 the majority of the trip too. im very happy w/ the miles per gallon, considering its a V8, and i had 3 other full sized adult passengers in the car with me. With the way gas prices are, i have only been putting in 87 octane since october.
  • Sorry cannot help with the sun roof, as my allergies are too bad with it open, but impressive about your MPG on your trip. How much mileage (total) on your GXP, have you seen it get better at some point (5K/10K)? My city/hwy mix has been 21-23 (with AC on) and city only is 17-18 with a lot of "horsing around." I haven't had a long freeway trip yet. So it runs ok on 87? I have been using mid-grade/premium mix. All of the horsepower curves are shown for premium, has anyone seen the curves for mid-grade or regular? That would go a long way to understanding if there is a difference MPG wise versus the various grades of gas. I know we aren't talking about a lot of money just interested. Ray have you seen any?

  • dblducedblduce Posts: 58
    I topped my tank off on saturday night for a dinner meeting, about an hour round trip. the next day i took it on my road trip. when i got home, it was almost on empty, so i filled it up again. i had gone 396 miles, and it took about 14.3 gallons, which is roughly 27.8 MPG. i have around 8,000 miles on my car, and run 87 octane. normal driving around town, i avg about 17-18 also.

    the only change i made to my car was install a K&N air filter back in december. ive used these air filters in my other 2 GTP's ive owned, and it seemed to help it run a little better. it sounds better too. as for helping the gas mileage, im not really sure. This was the first major highway trip i took with it, so i have nothing to compare it to before i installed the air filter.
  • I've been fiddling around with various techniques with my VERY NEW gxp. I've got less than 600 miles so far and I often reset my mpg meter. So far, I've gotten a shade under 20 mpg for mostly city/some highway. On the highway, I measured it on one long stretch of flat highway 60 mph, and eaaaaasy on the gas. I hit an honest 28 mpg for about a thirty mile trip, and that included a few on ramps and off ramps.

    The 'problem' with this car is it is so darn fun to push that throttle. :surprise: This car makes basically every other vehicle on the road just disappear in the rearview mirror.

    I filled my tank about 150 miles ago and I haven't touched the mpg meter...I'm now showing 18.5 mpg on the computer but I've been giving the car a run for its money now that the engine is getting broken in.

    I still have yet to do a long highway cruise. I KNOW I can beat the EPA numbers cuz I've done it with every other domestic I've owned...
  • rmozolrmozol Posts: 124
    That did it dakota! I also noticed the noise after a little driving the other day. I closed mine a tad, after being opened, and I heard a LOT of noise reduction. Maybe Pontiac should have had this reduced setting for max opening huh?
  • rmozolrmozol Posts: 124
    Today, I noticed a new noise. I closed the driver's door, and heard a "clanking" from under the car. It did this each time I shut the door. It sounded like a piece of sheet metal rattling on something. I immediately thought about the catalytic converter covering? I'll jack it up Thursday and check it out.
  • chats1chats1 Posts: 158
    After driving home from work (about 45 minutes to an hour commute), when I would get out of the car and walk around to the other side I would hear a noise coming from the rear left side (driver's side in back). I described it as a putt putt sound; the dealer called it ticking. I was told both by my brother and the dealer that that noise is normal. It's the exhaust pipe. I think, if I'm right, they both told me that the exhaust pipe gets hot and expands and causes that noise. Is that your noise? the dealer also told me that a lot of customers have brought their cars in with the same noise. So, I don't worry about it. Does anyone ever get a squeak when they shift from drive to park or from park to drive. I was getting that squeak quite often. I had it in a few times. They lubed it, then replaced a part on the driver's door, replaced the trim around the gear shift and then replaced the door lock activator (last time I was there) on the passenger side and lubed it again. They finally heard the noise before the fourth visit. So, after I left the last time when the passenger door lock activator was replaced I got to work and heard it again, and then three more times. But, now I haven't heard it at all for about three weeks. Could it be weather related? Any input on this would be appreciated. Thanks. Chats1
  • bob97bob97 Posts: 16
    Every car I’ve owned ‘ticked’ from the engine compartment while cooling down, but I do not recall ever hearing the exhaust tick. No squeaks shifting either – at least none that I can hear.
  • ocmike3ocmike3 Posts: 232
    almost every newer car I have drive has the heat contraction ticks/pings/chinks coming from the exhaust system.... whatever you want to call it. The pipes get hot and the sound is the metal contracting as it cools and the stresses formed from heat expansion and the bends formed in the pipes causes them to make a ping/tick/ the metal contracts. Because the metal used now-a-days is thinner(often stainless steel) than it used to be the contraction and expansion is more pronounced.
  • gxpjoeypgxpjoeyp Posts: 38
    All right all my fellow 06 gxp owners,what is the deal with the hissing coming from the interior when i first get in the it the feds?? ha ha...its not that annoying im just curious why it makes that sound? Is it the radio or something else,especially if there is no key in the ignition.Or am i the only one with this problem...p.s. im from the midwest so i dont think its a rattlesnake...ha ha.
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