Whine from back end (plus poll)

[improviz]

Wow, exactly same as what mine told me....which I found out in researching this is the same reaction GM gave to CTS owners years ago who were having the same issue.

[Boomer]

Well... Dealer told me it all sounding normal back there - Only thing left to do is get a ride in another C8 to figure out what "Normal" is.

Tough to tell. Have heard the "whine" if I listen closely. Sounds like normal mechanics. Car works great!

[Hrobincpa]

I will be attending the Spring Mountain school in March and will compare the sound in the C8 there to my C8 to see if theirs has the same whine as mine. I’ll post an update upon my return from the school.

[GaryCoral]

Much appreciated - I was thinking of going to that school too, but couldn't work it out... All of us who have this will be very eager to hear what you find - Really getting sick of listening to it!

[jimmyb]

"Normal"
The canned reply of every LAZY service writer on the planet

[Hrobincpa]

I mentioned the whine in my C8 to the local dealer tech. His notes on my paperwork said he drove it for over an hour and never heard it. It just so happens I had recorded my odometer when I dropped off the C8. When I picked up the car, the miles on the odometer had not changed! Time for a new dealer!

[John]

would contact the owner and let him know and secondly, contact GM. That is outrageous and unethical conduct on their part.

[jagtoes]

I mentioned the whine in my C8 to the local dealer tech. His notes on my paperwork said he drove it for over an hour and never heard it. It just so happens I had recorded my odometer when I dropped off the C8. When I picked up the car, the miles on the odometer had not changed! Time for a new dealer!

If you leave the PDR on all the time or when in valet mode you can go back and show the dealer GM .

[Hrobincpa]

I will follow up with the dealer when I return from Spring Mountain and after driving another C8. I have a 1LT, so no PDR.

[improviz]

Realized I'd never updated this thread. After a bit of escalation, Service Director went for a test drive and recognized the sound immediately as a ring/pinion issue once we got up to 45 mph. They brought in GM Engineer/Tech who also drove it and approved a replacement, then it went to GM for final approval. Once they got recordings with the "big ears" of the tranny, they appoved it and I received a new transmission earlier this month.

[Sabre]

Realized I'd never updated this thread. After a bit of escalation, Service Director went for a test drive and recognized the sound immediately as a ring/pinion issue once we got up to 45 mph. They brought in GM Engineer/Tech who also drove it and approved a replacement, then it went to GM for final approval. Once they got recordings with the "big ears" of the tranny, they appoved it and I received a new transmission earlier this month.

This topic has been on my back burner list for a while. This is GREAT news improviz. Way to persevere and come to a great resolution. I continue to do most of my break in driving with no sound distractions to listen to everything. That tranny replacement has got to be over $600!! All kidding aside, My question is how did they finally come around? I thought you were done after their first denial in January. That is great service! Thanks for posting back.

[improviz]

Thanks! Oh, I just bypassed original service manager, went up the chain a bit in the dealership and also got a GM social media rep who posted on the corvetteforum.com involved, though not really sure if she accomplished much of anything. Just kept my cool and presented facts, also made point that if differential failed at some future point it could cause an accident. Anyway, sometimes you've gotta go up the chain a bit to get things done, glad they came through for me.

[GaryCoral]

How is the new one? ANY whine??

[improviz]

Yes, as mentioned on the other site, it has developed a very slight whine above 50 mph in the last 100 miles or so. I just crossed 500 miles, but I'm still gonna granny-drive it for a few hundred more to give it all the time in the world to break in gently. Right now it's very slight, but it has gotten more noticeable as I accrue miles (deja vu), so let's see how it does over the next few hundred miles. Keeping fingers crossed.

[Sabre]

improviz, You hear this with your windows closed and top on? Sounds like everything is closed up. What is your build? I know you have a z51, but do you have a COUPE or HTC? MAG RIDE? I know that sounds silly, however, MAG ride completes the PTM ... maybe there are different messages being exchanged.
You crossed 500 miles on the new DCT?
I have a trip planned for tomorrow though I am only at 120 miles.