I've got a 2004.5 LLY w/ about 6500 miles on it. It seems like there is a very low frequecy drone or vibration from 1500 to 2000 RPM. As soon as I'm above 2000 RPM. it's gone. I've got it with and without Predator. It's not bad, but I don't seem to recall this when it was new. Maybe it's just normal for this motor? What do ya'll think?

Have the same problem on my 2005. Had the reflash done today - no difference (had already the latest SW according to GM). Drove one new truck from the lot to compare and it had the same drone at the same rpm range. I have driven and 2004.5 LLY (like yours?) before and it did not have that drone. Also the old LB7 I drove did not have that noise.
Will check into modification (intake, exhaust...). Too bad that with other tune (Predator) the drone is NOT gone like you said. So there might be a problem with the noise damper on top of the air intake or the like.

I have the same issue which started around 17,000 on my LLY. Dealer told me GM is aware and researching to try to find a fix. My did not do it the first 16k.

Thats interesting!
Dealer drove my truck today and said its normal. Looks like it depends where you go........
Hope they find a fix, drives me nuts...

mahalkita,
the reflash you had done, what exactly it that. I have a 05 dmax and i am new to diesel trucks. I was just wondering if i should get this reflash. And what exactly does reflash mean. Thanks for helping out a newbie.

I have a 2004.5 and my truck does the same thing but not all the time.

fitfarms,

you can find plenty of info regarding the reflash on this website. Many real specialists can explain that to you much better than I ever could.
I tried to get the reflash done but the dealer said I have already the latest Software - so they did nothing. The reflash addresses lots of issues and also lowers fuel rail pressure and therefore combustion knock - engine noise (thats all I was interested in)

I get the drone vibration in 5th on city streets. It is pretty noticable since when I left off the throttle and the convertor disengages it seems to go away. It might be there in all gears but since it shifts so fast I don't notice it...or it may just be 5th.

The interesting part is the Tech ask me if I noticed it when I came in to pick up my truck from getting it reflashed, I told him it was one of many items I had listed on my service order. He said when he test drove it he heard it "and his 04.5 LLY does not do it has 7500 mile. and he noticed it right away. He contacted tech at GM to disscuss and thats what they told him.

I think that 'drone' is the lockup torque converter noise when it is locked up. Is the drone also associated with the engine RPM dropping a bit, and being exactly matched to the wheel RPM (IE the difference between locked up and not locked up?)

If this is the same thing, then I agree it is annoying but it may be normal. I am wondering the same thing--how to get rid of it..

regards...

My does the same thing. Has done it since day one. Defnitely related to the converter. Drives me nuts too! Dealer checked it out and admitted that the 2004.5's don't do it but the '05's are. Doesn't know the cause but had reported it to GM as he's had quite a few complaints.

Mine does it in any gear and also at standstill reving the rpm up but not as pronounced. Noticable most when accelerating and deccelerating. Reaching 2000 rpm than its OK or falling below 1500 rpm also fine...drives me nuts too. I am wondering if there are different noises as some having the problem only in 5th gear (lock up converter).
I also think the problem is only with the 2005s not 2004.5s (at least not the test vehicles 2004.5 I have driven but who knows - some have that problem also on their 2004.5s

My 04.5 does it! Very annoying. It has done it since day one. I posted a question regarding this on the board months ago hoping one of the techs would know what it is. Still not sure what it is, I have just learned to live with it. Mine is between 1700-1800 rpm. I just try to avoid that rpm range.

I have the exact same conditions as blackmax04. Has done this since it was new...

dmaxhd, how many miles do you have on your truck if you don't mind me asking. Also, does the drone seem to be better, worse, or about the same as when it was new.

It could be my imagination but, mine seems to be slightly worse than when it was new.

Mine is an 04.5 and it DID NOT DO IT until I got around 17,000 miles, so to say it is normal? I dont know. Mine only does it at steady speeds in that RPM range.

The drone from 1700 - 1800 rpm is normal. It is rpm specific. I'm pretty sure that is is a harmonic from the exhaust. It is there in that rpm range regardless what speed you are traveling.

I would be interested to see if anyone who has gone to a 4 or 5 inch exhasust still has it after changing the exhaust. I'm betting that the would see that it would go away or move where it occurs in the RPM range depending on the particular exhasut setup.

I have the MBRP turbo back 4 inch exhaust. Slight drone but I don't mind it. It would be interesting if someone who has had their tranny upgraded with a new torque converter has the drone or not.

My 2004.5 does it too, and it just started at about 11,000 miles. It seems to get worse when the TCC locks up, and it's rpm-dependant. If it had done it from new then I might think it was normal, but my LLY didn't do it at all for the first 11,000 miles. It was really quiet then. I would really like to know what is is. I'm thinking it could be an engine or transmission mount problem because it seems to mostly go away when I let up on the throttle so that it is kind of "coasting". If I let up completely it comes back, but not as bad.

Mine does it in any gear between 1700-1800 rpm's as I stated but, does not do it in park or neutral for what its worth.

I lean towards the driveline vs. exhaust. Some have said torque converter. It just "feels" more like a driveline noise or "harmonic".

My truck has 13000 miles on it and has always done it. I was first drawn to this site seeking an answer to this very question and was comforted to know mine was not the only truck that did it. I try not to worry about it anymore.

I have the same problem between 1500 and 1800 rpm with with 6000 miles on the truck. Seem to be getting a little worse. I also noticed that the range of the drone changes when I have my camper on, could be because the truck sits a little lower or it has to work harder to keep the same speed.I had a 6 liter Ford 2003 that had the same problem and drove me crazy which was one of the reasons I got rid of it, they tried changing the turbo pedestal to to correct the drone but it did not help. My truck is 2000.5 lly built in April and over all I am much happier with this truck and even though it has the drone it is much better than the Ford was, but it would be nice to get rid of it also.

Is th knocking you are referring to a pre-detonation noise commonly heard in gas motors running bad gas? It is louder under load and while accelerating heavy?

Will reflash cure this? I have an 05 DA with 7500 miles on it that sounds bad under acceleration.

No, I think that type of "pinging" is referred to as "Fuel Knock". There's been talk that the re-flash is suppose to help that. What we are speaking of here is more of a humming / moaning sound while cruising at the effected RPM's / MPH's.

Just bought a 2005, its in the shop today for the second time. Its done it from new (4 miles) till now, 2500 miles. I kept my past trucks for 230k and 245k miles and I don't see myself driving this truck with that annoying moan. It comes on at 1700-1800 which is 55-60 mph, does it in all gears and neutral. I know 5 people with a duramax and none have this problem, my luck. Hope they figure it out because I like the truck, but will not put up with that noise for a few hundred thousand miles. Not after paying $40k.

I am not sure that it is only the 05's and up. I have a 2003 and I am very aware of the noise that you folks are describing. Maybe it is something else, I am not the best and filtering out engine/drivetrain noises, but it seems to be the same. I stumbled across this thread because of a post in the 2500 & 3500 forum. I usually do not go through the LLY forum.

My truck has made this noise for a long time. I have solved the problem using the factory installed sound dampening device.....the radio.

Greg

I used HeavyD's fix with the Bose. All is good.

I am new to the forum and to the Dmax. First time deisel owner. LOVE it. I have big plans but small pockets.

Scott

I am with breeze70ss on this one! For a 48K (MSRP) truck that noise is NOT acceptable. Turning up the radio won't do because its a factory defect and has to be solved by GM in one way or the other

I have 05 lly with 7000 miles and i for the last 1500 miles have had the same problem. There is a low humm that is heard but also felt in the peddles. This is felt in all gears but 5th about 1000-2500 RPM. This was not there for my first 5500 miles. Let me know what anyone finds out.

It's not just the new trucks. My 03 has hummed for 2 years. Drives me nuts. So far the dealer has replaced the tranny, 1 rear axle, checked injector balance. I gave up on them and replaced all ujoints and hanger bearing. Still have humm. Just recently I found the bracket holding the downpipe to the motor has a broken weld. I am hoping thats the problem, have not had time to have it fixed. When I do I will post the result. It would be good to hear if anyone with the symptom changed exhaust and seen the humm go away or change.

If I remember correctly somebody with the problem changed the exhaust to a MBRP system and the problem is still there, but I am not sure if that was a complete or after cat

It's not just the new trucks. My 03 has hummed for 2 years. Drives me nuts. So far the dealer has replaced the tranny, 1 rear axle, checked injector balance. I gave up on them and replaced all ujoints and hanger bearing. Still have humm. Just recently I found the bracket holding the downpipe to the motor has a broken weld. I am hoping thats the problem, have not had time to have it fixed. When I do I will post the result. It would be good to hear if anyone with the symptom changed exhaust and seen the humm go away or change.

IIRC there were several posts awhile back about that bracket weld breaking and causing a noise problem The '05 droan / moan noise is a different noise though.

My 2004.5 does it also and it started around 17000 miles, i also noticed it causes the rear window or something behind the seat to vibrate and it drives me nuts, getting ready to take it in next week to have the dealer look into it, my drivers side power extending mirror is also loose and vibrates. I have already had the re-flash done so that is no cure.

[QUOTE=h8pvmnt] i also noticed it causes the rear window or something behind the seat to vibrate and it drives me nuts.........

Thats an interesting observation. I have exactly the same problem with my 2005. The rear window or something vibrates and I don't know why and what it is. Did the reflash also without success.
Hope you find the reason and the cure!

:grd:

My 2005 3/4 ton HD Duramax is 3 weeks old, it is currently in the shop for the second time. First I took it to the dealer where I purchased it from. They told me that the humming sound is coming from the differential. It was taken apart and put back together only to tell me that it wasn't the problem after all. I took it to a different dealer and demanded that a tech ride with me to hear the noise. Before I left the lot with the tech I put in neutral and got it up to 1700rpm and the noise was there for both of us to hear. Next we took it for a test ride and again the noise is there. So now they know that there is a problem. 2 techs took 2 different 05's for a test ride and found no noise like the one I was having. They said this was not normal (no der)Censored . Now I get a phone call from the service manager telling me that there is "harmonic noise" that they are going to try to locate and correct the noise issue. He seems confident that they will find it and correct it :blahblah:. I 'll keep everyone posted.:horsey:

Try it in 4x4 see if its worse. Mine did the same thing and it needed a new front axle. If don't have 4x4 I'm lost on that one. Hope this mite help.

Try it in 4x4 see if its worse. Mine did the same thing and it needed a new front axle. If don't have 4x4 I'm lost on that one. Hope this mite help.
You may be correct, but there are a lot of people here with this issue. I find it hard to believe that there are this many bad front axles. I would have to suffer from catastophic failure before I subject my truck to front axle replacement. I am HOPING that you are incorrect...

TREK5200, please do keep us posted. At present, the hum/drone is the ONLY gripe I have with my truck.

I have a 2004.5 LLY. Mine does it at 45 and at 60 then goes away. It has done it since @2K. I haven't took the truck in yet. But it pisses me off that I spent 48,000 on a truck that makes irritating noises.

The harmonic noise trek5200 describes makes sense to me. I had tried to remove the noise damper on top of the air intake to check and the noise got worst in that same rpm range. Hope they really find it and please keep us posted. The wife is already upset (she drives the truck most of the time). I have traded a perfectly running noise free Avalanche for that one - now I have the noise, pay more for fuel, the keyless remote does not adjust the seats...etc. hard to justify that truck already...

The harmonic noise trek5200 describes makes sense to me. I had tried to remove the noise damper on top of the air intake to check and the noise got worst in that same rpm range. Hope they really find it and please keep us posted. The wife is already upset (she drives the truck most of the time). I have traded a perfectly running noise free Avalanche for that one - now I have the noise, pay more for fuel, the keyless remote does not adjust the seats...etc. hard to justify that truck already...
Mahalkita, what you say here is exactly what is happening to me:exactly: . The wife is pissed off, I traded a 01 BURB for this Duramax and your right on for the gas going up, and the key less remote does not adjust the seats. Maybe our vehicles were cloned. I called to see how my truck was doing and they tell me they are having a hard time locating the source. I feel your pain.:help: Tomorrow's a new day, let's see what happeneds next.:ro)

I had an 04 that made a noise that started at just under 2000 rmp's and would stay there till you let off and it dropped below that again. The noise in my truck sounded like a dust buster under the hood. Not real loud but very annoying. The dealer had it for about 2 weeks on and off, and still did not fix the problem. They replaced turbos and exhaust but could not get it to go away. They (the dealer) finally took it to a local diesel shop that diagnosed it as being a exaust fitting on the back of the motor that feeds the turbo I beleive. They said they have seen this problem on the 6.0PSD's as well. Same turbo. Anyhow they replaced that part and the noise went away. If this sounds like the same noise you guys are suffering from I will call the shop that finally fixed it and get more specific info from them. What an annoying noise.

trek5200,
thanks for your sympathy! Thats helps a lot! Feel exactly the same way than you. Hope somebody really finds it. I like the truck but that drone noise is not acceptable. Sounds like a cheap small 4 cylinder engine and not like a big V8.
gtaylor
My truck also sounds a lot like a dust buster under the hood and I think its some kind of resonance somewhere where you describe it (near the turbo...) I am just wondering that soo many have that problem, if that part is bad why so many times? Maybe a crack in the exhaust manifold? To me it looks like its getting worst over time and was not bad when I got the new truck in Sept. last year. I test drove a newer built truck than mine at the dealership with the same result but the drone was not that bad like mine is now. If it is not repairable I will give the truck back... after many years of waiting I surely don't want that to happen

:help:

My 05' does this also, it's been doing it since I got (4 miles) I notice it right at 60mph. It doesn't really bother me, I don't stay at 60 long enough for it to be a problem. It hasn't got worse or better, it's stayed the same.

The dealer installed 2 different turbos and many other things to try to solve it with no success. The shop that fixed it for them said that it was fairly common on the Fords and they had seen a few LLY's come in too. Now this was back in October or November so LLY's had only been out for 6 months or so. Just needed to get some miles on them to show the problem. Mine showed up at about 4500 miles. Now the fix didn't seem to complicated to them. Took an hour or two if I remeber right. I really think you guys might be suffering them same noise. I'll call the shop on in the morning.

:cool2: Thanks gtaylor that would really help us!

OK, talked to the Diesel shop and dealer mechanic this morning. The diesel shop said that all the turbo connection pipes have steel gaskets and that they have seen alot of trucks come in with leaks around these gaskets. It might be because they are not tight enough from factory or getting loose from expanding and contracting with heat. The dealer mechanic that did the repair told me this morning what the two things he finally did to fix it were. First, the egr pipe that has some aluminun resonator type piece on it returns back into the turbo area, was loose and when removed noticed it had a warped flange. He replaced that pipe and also the gasket, and the gasket at the turbo outlet. I have not looked at the turbo to see were he is talking but some of you that know your trucks might know from what I've said. Know I noticed that some of you guys have only noticed it as you are dirving. My truck would barely make the noise when parked or power braked. But when you would be driving down the road it made it BAD. The dealer thought at first that it was tranny related, but come to find out it was and exaust leak.

OK, talked to the Diesel shop and dealer mechanic this morning. The diesel shop said that all the turbo connection pipes have steel gaskets and that they have seen alot of trucks come in with leaks around these gaskets. It might be because they are not tight enough from factory or getting loose from expanding and contracting with heat. The dealer mechanic that did the repair told me this morning what the two things he finally did to fix it were. First, the egr pipe that has some aluminun resonator type piece on it returns back into the turbo area, was loose and when removed noticed it had a warped flange. He replaced that pipe and also the gasket, and the gasket at the turbo outlet. I have not looked at the turbo to see were he is talking but some of you that know your trucks might know from what I've said. Know I noticed that some of you guys have only noticed it as you are dirving. My truck would barely make the noise when parked or power braked. But when you would be driving down the road it made it BAD. The dealer thought at first that it was tranny related, but come to find out it was and exaust leak.
OK....Who's first?
Tough thing is, I'm not sure we're all talking about the same thing.
If this thing is exhaust related, then I'm wondering why it goes away above 2000 RPM?

OK....Who's first?
Tough thing is, I'm not sure we're all talking about the same thing.
If this thing is exhaust related, then I'm wondering why it goes away above 2000 RPM?
Ok, here's what I found out so far. The dealer narrowed it down to a power steering pump. They still need to take it out for a test drive. Will see....:secret:
at least for my harmonic noise.

Hi
I have the same drone at about 45 mph. It is gone by 50 and not there at 40

Hi
I have the same drone at about 45 mph. It is gone by 50 and not there at 40
Ok ALL,
I jumped the gun when the tech told me it was a power steering pump. They told me they found and fixed the problem were the noise was coming from. The power steering pump was switched out from process of elemination, but it wasn't the issue. The noise was coming from a heat sheild were the exhaust is at. A Regional Tech happen to be at this dealership to help figure this out which he found the problem. I'll be picking it up tomorrow and I'll have the work order which they tell me is 2 pages long. I need to test drive it first before I get really excited, I'm keeping my fingers crossed. I'll share with you what they found in detail.:ro)

I think its really an exhaust related problem. Some leak or vibration (heatshield..) all make sense. The reason why it only appears in that rpm range is the fact that the engine makes the most torque and the most mechanical stress to the parts in that region IMHO. A resonance is always only in a certain range and there might be another harmonic resonance above that but with less intensity.

Hope we get some results soon...thank you all!

I just traded a flawless 03 4x4 Crew cab diesel for the same in an 05. Why? Well I thought the new one would only be better. But the new one has 1200 miles on it and has already been in the shop twice because of the droning noise. It is related to 1700 or 1800 rpms whether on the road or in park. The service manager seems to think that it could be linked to an exhaust system vibration or the left motor mount. It is in the shop to have the mount changed now. If anyone has been able to solve this problem yet please advise. My 03 never even came close to making this type of noise.

Does anyone else who has an '05 with this this "moan" sound have the EGR blocker plate installed? If so, did it seem to make the moan worse? Could be just my imagination but I think my noise is getting louder.

So, now that we all have this problem, how do we get GM to solve it??

My 05 is bone stock with 5K on it. I'll make sure I turn the radio off today and listen really hard for anything. The only time I hear anything is when the converter first locks up when its warming up. otherwise i just hear the motor rattling away:confused:

I have the drone BUT only in 5th gear when the converter is UNLOCKED.
The first time this happened to me I almost s#$t myself, it is loud and weird sounding. Then the noise goes away and all is normal, next morning samething. Then I noticed that all of this was happening at the same cold temps and during warm up on the highway. I let the truck idle for 10 min or so then drive about 3 miles at 35mph before hitting the highway. The drone always starts at around 55 and stops at the same time that I see the rpm drop when the converter locks.

Everytime it is cold outside and I know that the TC is unlocked in 5th I have the drone, TC locks and no drone.

I have the drone BUT only in 5th gear when the converter is UNLOCKED.
The first time this happened to me I almost s#$t myself, it is loud and weird sounding. Then the noise goes away and all is normal, next morning samething. Then I noticed that all of this was happening at the same cold temps and during warm up on the highway. I let the truck idle for 10 min or so then drive about 3 miles at 35mph before hitting the highway. The drone always starts at around 55 and stops at the same time that I see the rpm drop when the converter locks.

Everytime it is cold outside and I know that the TC is unlocked in 5th I have the drone, TC locks and no drone.

Exactly!

Maybe we all need to be placing a call to someone at GM. Squeaky wheels get the grease.

My 2005 3/4 ton HD Duramax is 3 weeks old, it is currently in the shop for the second time. First I took it to the dealer where I purchased it from. They told me that the humming sound is coming from the differential. It was taken apart and put back together only to tell me that it wasn't the problem after all. I took it to a different dealer and demanded that a tech ride with me to hear the noise. Before I left the lot with the tech I put in neutral and got it up to 1700rpm and the noise was there for both of us to hear. Next we took it for a test ride and again the noise is there. So now they know that there is a problem. 2 techs took 2 different 05's for a test ride and found no noise like the one I was having. They said this was not normal (no der)Censored . Now I get a phone call from the service manager telling me that there is "harmonic noise" that they are going to try to locate and correct the noise issue. He seems confident that they will find it and correct it :blahblah:. I 'll keep everyone posted.:horsey:
:thumb: I'm happy to say that my "DRONE IS GONE" :ro)
The exhaust pipe would flex every time it reached 1700rpm. So what they did was welded to clamps to the pipe up by the engine and wa-la it's gone. The tech who worked on it also explained that a phone call was made to GM to find out if there was any issues of this kind with other owners. Beleive it or not there was only 1 other complaint. Now what they want me to do is drive it for a few days to see if the drone comes back. If drone does not come back then they'll (GM) post a bullentin. Good luck!

:thumb: I'm happy to say that my "DRONE IS GONE" :ro)
The exhaust pipe would flex every time it reached 1700rpm. So what they did was welded to clamps to the pipe up by the engine and wa-la it's gone. The tech who worked on it also explained that a phone call was made to GM to find out if there was any issues of this kind with other owners. Beleive it or not there was only 1 other complaint. Now what they want me to do is drive it for a few days to see if the drone comes back. If drone does not come back then they'll (GM) post a bullentin. Good luck!

Good work! Hope this is the cure. It would be great to have names an 3's of someone at GM who is in the know about the fix to refer the tech's to who are working on our trucks.

:grd:Thanks for that good info! Will check it out asap! Seems my dealership is not really interested in a solution....

I want to share what they did to find the problem from my work order:

customer states humming type noise from engine when driving and at idle approx. 1700rpm. checked mounting around engine area, repositioned ground strap at master cyl away from fuel line disconnectors. test drove, noise still present. removed serp belt and started vehicle, sounded better retorqued all acce. mounting bolts and checked p/s pump movement for pulley, ok fluid is clear, no contamination noted. checked idler bearings, ok. tensioner is good,installed belt and removed the fan and clutch assy, noise is better. removed stock unit fan and clutch and installed on this vehicle, drove vehicle approx. 2 miles noise still present. road tested with field tech. advised poss induction noise. removed induction plastic and drove. noise present. downloaded updated software to pcm for noise issue at 1700 to 1800 rpm, noise present.
reinstalled all air induction system and original equipment further checking found noise from exhaust has doc. information for noise. mounted/welded 2 weights in front of converter forward at bend. test drove to verify noise is now gone.

Here are the part numbers that were used:
qty number description
2 10199232 dampner A 3.704
1 ZP5000 pick-up diff.

Trek 5200:

Wow, Looks to me like you found yourself a really good Tech.!
Better buy that boy a case of cool ones!

Thanks for the info.

Yes what he said!
Wished I had a Tech. like that at hand!

Trek,
Did your truck have a vibration at idle.GM is currently hunting this issue with my 04 CC.They have the district service manager coming to inspect the vehicle before the case goes up to the field engineer. The dealer confirms the vibration is present and is unacceptable. Vibration is worse when engine is cold and improves once engine is at operating temps. I feel the vibration in the steering wheel, brake pedal and it can also be felt in the front bumper and certain parts of the engine. Please inform......
Thanks Laker:(

Trek,
Did your truck have a vibration at idle.GM is currently hunting this issue with my 04 CC.They have the district service manager coming to inspect the vehicle before the case goes up to the field engineer. The dealer confirms the vibration is present and is unacceptable. Vibration is worse when engine is cold and improves once engine is at operating temps. I feel the vibration in the steering wheel, brake pedal and it can also be felt in the front bumper and certain parts of the engine. Please inform......
Thanks Laker:(
Laker,

My harmonic noise, happened 2 ways. I would be in park or neutral with the vehicle not moving of course and reved until I reached 1700rpm and that's when only I would here the noise. The other way would be when I'm driving once I reached the 1700 rpm point again the noise would be much louder because of the added road noise and the moving parts of the vehicle. I did feel some vibration underneath my floor board when I was driving. Since after picking the truck up from the shop I drove for about 60 miles and went up and down the tach, and driving as fast as 90 mph, the sound has not come back nor the vibration from the floor board. :ro) :ro) Print the posting I did that came from my work oder from the dealership and take it to your dealer, if you haven't already done it. Let me know if you need more info.

I headed to a local dealer today where I took my truck in November to have the noise documented (no fix). I have your info inhand and will report their response.

I wonder if Eric is listening????? Like to hear his opinion and if he needs a test vehicle to give it a try I'd do the 3 hour drive to see him :) Anything to get rid of the NOISE!

trek5200,
could you look under your truck what the tech did exactly. I think I understand it generally - he stabilized the downpipe (flex) going to the cat. Thats why the other guy who changed to a new exhaust still has the noise - I assume he changed after the cat and the problem is before the cat.
Could you look for us and see for yourself what has been done?
Thanks a lot!

:):):)

trek5200,
could you look under your truck what the tech did exactly. I think I understand it generally - he stabilized the downpipe (flex) going to the cat. Thats why the other guy who changed to a new exhaust still has the noise - I assume he changed after the cat and the problem is before the cat.
Could you look for us and see for yourself what has been done?
Thanks a lot!

:):):)

If you could add a couple pics, that would be even better. We appreciate you sharing the info. If this is the fix, you are going to be helping alot of people!

There could also be a nomination for "DP member of the year" in it for you :)

I think whats being done here is not necessarily "stabilizing" the down pipe, but rather adding mass / density to it sort of what they do to submarines to make them quieter.

Yes, pictures would be really nice! Adding mass would make sense to change the resonance frequency and damp it....hope we'll see it.

Paid a visit to my dealer. Talked to the S/M and he looked at the info and said they would give it a try. He said they have done similar fixes to gas vehicles. He described the part used as a hockey puck sized weight which they commonly have in stock.

I will be making an appointment with them and will report back any results. Might be a few weeks though.

Paid a visit to my dealer. Talked to the S/M and he looked at the info and said they would give it a try. He said they have done similar fixes to gas vehicles. He described the part used as a hockey puck sized weight which they commonly have in stock.

I will be making an appointment with them and will report back any results. Might be a few weeks though.
Skoryaro.
F.Y.I, if by chance your dealership needs to talk to someone at the dealership where I had my work done since it's fresh in their head, here is the contact information.
Courtesy Chevrolet
3640 Stevens Creek Blvd.
San Jose, Ca. 95117
(408) 249-3131

My invoice #CTCS26696
The mechanics name is Doug who did the work.
Jeff Ide is the Service Director

:grd:

Skoryaro.
F.Y.I, if by chance your dealership needs to talk to someone at the dealership where I had my work done since it's fresh in their head, here is the contact information.
Courtesy Chevrolet
3640 Stevens Creek Blvd.
San Jose, Ca. 95117
(408) 249-3131

My invoice #CTCS26696
The mechanics name is Doug who did the work.
Jeff Ide is the Service Director

:grd:

Your the best - thanks!

Trek5200, Did your drone go away if you took it out of OD @55-60. My truck does this at 45mph and them goes away and reappears @ 58-60mph, then goes away again. I haven't tried putting it in park and reving it to 1700-1800rpm's too see if it does it. Also, mine is 10 times worse in 4-wheel high. Does my problem relate any to yours. not sure if we have the same Drone. Thanks for the help, Troy.

My Dodge has a drone like you guys are describing, from about 2000 to 2300 RPM but only when I am pulling a trailer. When I let off the throttle it goes away, when I load it up the drone comes back. Drives me freaking nuts when I'm on a long trip with the trailer. The dealer says its normal, go figure. I bought my Dodge in Dec. It was a toss up between the Dodge and the GMC Dmax, took me months to make up my mind. It doesnt seem like it mattered much, they all have problems! I wish someone would make an HD Diesel Pickup that had no problems!!!!!

Troy,
My noise happened was much louder at 60 mph when I have my Hypertech installed. The noise also happened at 55 mph when Hypertech wasn't installed both at 1700rpm. I tried swithching in and out of 4x4 to see if I had a problem. The noise was still there. I tried playing with the tow haul button, and the noise was still present. I think what your describing you may have the same problem mine did. By having it in 4x4 just makes it worse since that's adding more noise and an increase in vibration. But I think by putting the truck in neutral in a stationary state and rev it up to where you start hearing the noise you can almost bet it could be the flex in the exhaust pipe. Not sure though that your drone could be in the exact spot mine was. Hope this helps.

Paid a visit to my dealer. Talked to the S/M and he looked at the info and said they would give it a try. He said they have done similar fixes to gas vehicles. He described the part used as a hockey puck sized weight which they commonly have in stock.

I will be making an appointment with them and will report back any results. Might be a few weeks though.


Made an appt to have it fixed (??) on 2/14/05.

My Dodge has a drone like you guys are describing, from about 2000 to 2300 RPM but only when I am pulling a trailer. When I let off the throttle it goes away, when I load it up the drone comes back. Drives me freaking nuts when I'm on a long trip with the trailer. The dealer says its normal, go figure. I bought my Dodge in Dec. It was a toss up between the Dodge and the GMC Dmax, took me months to make up my mind. It doesnt seem like it mattered much, they all have problems! I wish someone would make an HD Diesel Pickup that had no problems!!!!!
Victorbravo,
Go the extra step and do what I did. I made the dealerhip have a mechanic ride with me to hear the noise and also made them test drive other new trucks on the lot to see if the noise is present and or normal. They couldn't hear any noise from the other 2 trucks and they told me my noise wasn't normal. My truck is now 3 1/2 weeks old. These toys we have cost big bucks so open up a can of "kick a--" :ro)

trek5200,
I have driven a new truck from the lot and it made a similar noise than mine, but not as pronounced - so I thought there is nothing what can be done. Possibly we all have different noises but I am wondering why all the trucks have it at 1700 RPM. There is something wrong!
Maybe your noise was much worst I just have a humming resonance at 1700
RPM which is nerving my ears. This is not acceptable for a 48k truck IMHO.
My truck was quieter when new but not as quiet as the old LB7 or older LLY I have driven before.

Made an appt to have it fixed (??) on 2/14/05.

Truck is at the dealer as of 0700 hours today. They will have it overnight as they are going to try to solve the intermittent cold belt squeak issue also as well as a couple other minor things.

Will report my success or failure upon it's return :)

Truck is at the dealer as of 0700 hours today. They will have it overnight as they are going to try to solve the intermittent cold belt squeak issue also as well as a couple other minor things.

Will report my success or failure upon it's return :)

Update: Got a call from the dealer this AM. They said they ordered parts and will be keeping it another night :(. When asked what parts they said an exhaust dampner ??. Any ideas as to what that is?? I'm thinking the weights on the exhaust pipe didn't work. I also thought of a dampner as being the "harmonic balancer" on the crankshaft.

FWIW they also put a new intermediate steering shaft on it and are addressing the two cold start issues this AM: intermitent cold belt squeak and starter grinding noise (only happened once).

Will try to speak to someone in the know this PM when I pick up my free rental ride. It'll probably be a GEO metro and we're suppose to get 6" of snow tonight!! :eek: :eek:

Update: Got a call from the dealer this AM. They said they ordered parts and will be keeping it another night :(. When asked what parts they said an exhaust dampner ??. Any ideas as to what that is?? I'm thinking the weights on the exhaust pipe didn't work. I also thought of a dampner as being the "harmonic balancer" on the crankshaft.

FWIW they also put a new intermediate steering shaft on it and are addressing the two cold start issues this AM: intermitent cold belt squeak and starter grinding noise (only happened once).

Will try to speak to someone in the know this PM when I pick up my free rental ride. It'll probably be a GEO metro and we're suppose to get 6" of snow tonight!! :eek: :eek:


My bad - I didn't realize that the "dampner" is what the part was called as listed in the "fixed" post by Treck5200

Skoryaro,
Did your truck get diagnosed as the same problem as mine?

Skoryaro,
Did your truck get diagnosed as the same problem as mine?

Don't know yet - haven't gotten it back yet. There are 6 things on the list for them to fix and a couple are cold start issues. Dealer called me today and said job would be complete tomorrow. Meanwhile I'm still driving their Pontiac Aztek -:t

OK - got my truck back from the dealer and they followed Trek5200's fix for the droan noise as per his previous post. I'm happy to report that my drone / moan noise is gone after applying the same fix. I started a new thread including pics of the fix HERE (http://dieselplace.com/forum/showthread.php?p=492475#post492475)

Thanks trek5200!!

Isn't this a great site??

Skoryaro,
Let's hope that we started a trend here. Glad to help...

I posted in another thread - This is not a specific issue to 2500, 3500 or diesel engines - as I have an 03 1500 SS that does the exact same thing ...

It's been to the dealer and they solved NOTHING - no matter cause I'm tradin it in on my new 05 Dmax when it comes in from the factory ...

I posted in another thread - This is not a specific issue to 2500, 3500 or diesel engines - as I have an 03 1500 SS that does the exact same thing ...

It's been to the dealer and they solved NOTHING - no matter cause I'm tradin it in on my new 05 Dmax when it comes in from the factory ...
As I said in the other thread - I agree. Not a diesel thing. Same fix has been done on many a gassers. Just doesn't seem anyone applied it to solve this problem in our trucks until now and this happens to be a diesel forum :)

Trying to revive this thread a little. My drone has completely gone away with the onset of warm weather. Without question it is related to cooler weather. I'm sure once cool weather sets in again more complaining will begin.

Could the motor mounts be causing the problem????

I posted this message in the other thread too...sorry for the repeat...


My LLY did it yesterday and i told myself "its a diesel...deal with it". WELL!! Im glad I read this thread!! Thanks everyone for the tips/help. One question for skoryaro2...you said you had them replace the steering shaft because of the infamous CLUNK. My dad's 03 Tahoe did this until they replaced the shaft...i assumed GM had this fixed by 2005!!! Can I take my truck to the dealer and say "does mine have the newest steering shaft???" Even tho mine may not really clunk, its something that will annoy me until i KNOW I have the updated part!! haha..thanks!

---Ben

2005 silverado 2500 d/a - Thought I was going crazy! good to hear all others are experiencing the samd menacing 'humming noice' at 1700-1800 rpms. We need to all file a complaint with GM I garuntee all other 05 d/a owners are experiencing the same thing.

It really is that annoying.

My 02 has a distinct drone at the same RPM, but I have a big 5" exhaust!

This can be caused by harmonic resonance, which means at a certain rpm or several spots in the rpm range, the vibrations resonate along with each other, causing one big vibration. It's like pushing somebody on a swing and when you push at just the right moment (the equilibrium point), it does a lot more then when you do it too early or too late.

However, I know what a lot of people here are talking about is actually nothing more than an unbalanced driveshaft causing the vibration. It's only really noticeable at a certain rpm range when the vibrating resonates with other vibration, causing a "drone" like state.

I wouldn't worry too much about, as it will go away with time (unless it's something else although it most likely isn't it). Mine didn't do it when it was new until about 13k miles or so then did it for 5k or so then was normal again and now it's doing it again at about 30k miles.

My 2 previous new style gm trucks ('01 8.1 allison and '03 lby allison) did the same thing but when I sold it they hadn't done it anymore for a long time.

Hope this helps.

Later