TucsonJer

After reading some of the post here on the forum I realize that apparently this "warble" sound coming from the rear of my new 2017 Stingray isn't a new problem. I noticed it the very first time I test drove the car. When I returned from the test drive I told the service manager there was a weird sound coming from the rear of the car but it only seemed to do it during gradual acceleration. He had his Corvette technician go with me for a ride so he could hear what I was talking about. I told him it sounded like a problem in the rear end but once he heard it he told me it sounded like the harmonic balancer and it should be fixed as soon as Chevrolet issued a computer upgrade. He hooked the car up to a computer and told me that they hadn't resolved it as of yet. He even took another brand new Stingray on the lot and test drove it and said it was doing the very same thing. When I took my car in for the second oil change I ask about the problem and he told there still wasn't a fix. I just started reading the forum a few days ago and I learn that this "warble" problem has been around since the C7 was introduced. Now I'm beginning to feel that this is some big cover-up that they don't have a clue how to fix it. I'm going to take my car up to the dealer next week and find out what they intend to do to resolve my problem. I read one thread that said a rearend Change fixed theirs. Has anyone else been able to get theirs fixed. I've put 7000 miles on my Vette since I got it in May and things seem to work fine except for the warble sound which is kind of embarrassing when I take one of my friends for a ride and they hear it. I'll let you know what the dealer says after I talk to them. Jer

mountainears

Yea, push the issue, they should be trying some stuff I would think and do more for you. There are cars that have it, but it certainly isn't every car. Not sure if there are other dealership options in your area though too, that could be an option.

And if you get towards the end of your warranty, you may want to consider an extended warranty if you're still dealing with it. Hopefully not the case.

Highplains

Take this thread from this forum with you to the dealer https://www.corvetteforum.com/forums...asionally.html.

More importantly, show him this:


If he still won't believe you, have him call the Technical Assistance Center. There have been many whose dealers simply did not want to deal with the problem and lied through their teeth about what they say GM or the Technical Assistance Center has told them. GM DOES know about it and a number of diffs have been replaced, including mine.

curve65

This is still a big time bummer!

rolman

sure it isn't just exaust warble like from headers .is it a bubbling like sound.warble is a strange description.

Highplains

Read the original thread on the warble. Look at the video I posted. Speculation that it's the exhaust was ruled out long ago. The noise occurs at 1500 RPM with auto trans cars. When they replaced the diff in mine and other cars there was no more noise. My car was tested by a GM engineer and he told me personally that it was the ring and pinion that was not set-up correctly. The head of Corvette Quality Control would not have sent my dealer a new diff if it was the exhaust.

Maxie2U

As an aside has Strake ever heard back from the GM engineers who purchased back his car for the purpose of diagnosing this major problem?

spolk69

I too have the warble at 3000 miles 17GS. Pretty crazy. It's only done it twice.

beaversstonehaven

2016, A8, 1lt, Stingray. Mine had it VERY bad. I could reproduce it at will. Hit the resume on the cruse control from about 40mph up to 70mph and it would sing every time. Kind of an eerie sound. I knew I had 36,000 miles to deal with it if I needed to but it quit singing around 23,000 miles. I cannot reproduce it now. It's gone. I am going to go past 36,000 miles later today on my way to Houston and I decided not to get the extended warranty as I have not had a single problem with this car. I did not want them ripping the rear end apart and I am glad I did not take any action on this issue. For some strange reason sometimes I kind of miss that sound.

Strake

OP, this is my video that Highplains showed you. He is correct that the root cause was the ring and pinion in the differential. In the end, after GM Engineering sent an Engineer to put sensors all over the drivetrain of our '16 Stingray, at my local dealer, they bought the car back to use as the one to determine the actual cause.

I talked with the Corvette Quality Brand Mgr @ Carlisle a month ago and as soon as I told him my name, he immediately knew me, and said " the Video" !!! We had a nice chat about it and I expressed my sincere appreciation for his efforts to get to the bottom of this. He went on to say that GM is still having a time of it with the supplier of the rear differential owning up to the problem. He also said he knows exactly where my "warble Vette" sits at the Detroit Proving Grounds Labs.

As Pete said, take this video and link to the original thread to your dealer. I didn't see that you stated the specifics on your Stingray. Please advise if it is a base Stingray, NOT a Z51, Grand Sport, or Z06. Also advise if it's an automatic.

Don't accept that it's normal sound. Those that have had the new differential installed, have their issue resolved.

Richard

TucsonJer

Thank you Richard, I will definitely take the video to show them. My car is a 2017 Stingray LT1 A8.

Strake

With your car being the base Stingray, A8 you are definitely in the pool of potential WARBLE issue cars.

The differential is different for the Z51, GS and Z06. They all have the "eDiff" which is an electronic rear diff with different ring and pinion gears and it is a heavier weight rear . To the best of my knowledge, there are NO known Warblers in that group of cars, just the base model, A8.

When GM bought my car back, they had me special order what ever I wanted. To be safe, I wasn't going to get another base Stingray for fear of getting another Warbler. We went with the (at that time) newly released Grand Sport.

If you get push back on what this is with your dealer, tell them to call GM Tech Support and get to the Corvette Brand Quality Mgr. Trust me, they know all about this.

Richard

syswayne

That is really loud, hope mine don't start doing this, I havd 1K miles on it.

Strake

Too bad this thread WASN'T part of the original Warble thread to keep things in one place.

https://www.corvetteforum.com/forums...asionally.html

Rebel Yell

beaver, mine is the same set up as yours, and my warble went away at approx. 6k miles. It doesn't give me much solace though. Being it's the ring gear/pinion causing the noise I'm afraid it will come back with a vengeance, thinking wear on the unit is what stopped the noise. Of course if it does fall apart GM will be the one that pays. I bought the extended warranty.

Maxie2U

Thanks for the update Strake. I'm confused on one point, I thought the "warble" was due to the torque converter and/or A8 transmission that was why so many owners of A8s are having them replaced. But you say it's due to the ring and pinion in the differential.

I am NOT DOUBTING YOU, it's just that I am confused. Is the problem A8 owners are having a different problem than the differential "warble"?

rmorin1249

Same here. I had the warble for a while after my TC was replaced. After about 1k miles it went away. I did buy a 7 yr warranty so I'm not concerned as I will trade before then.

ElGreco53

Maxie, I think there are 2 different issues, with different symptoms. The T/C issue seems to be more like driving over rough pavement where the warble "sound" is so well documented in the clip above. Hopefully no one has had problems with both, gads...

Strake

Maxie,

These are 2 different issues completely. The WARBLE is a harmonic resonance noise which has been found to be the ring and pinion in the differential of base Stingrays with the A8 trans. It is always when running at 1500 rpm in any gear ( 4 to 80 at any speed, any driving mode, and any exhaust setting, or all of the above combinations.

The Warble has nothing to do with the other TC shutter or vibration issues in the transmission.

Maxie2U

I appreciate the clarification although now I'm a little bummed out since my car could develop two separate major problems. If I did not love my Corvette so much I would sell it before I have to deal with these major headaches.