Bring it in, let them do the oil change on it. If that doesn't fix it, then it was a bad/underfilled diff and you'll get a new one. Ask me how I know.
I had this noise also. I thought it was tire noise, but after new tires it stayed the same. I took it to the dealer yesterday, and had the tech ride along and listen. He immediately said the noise was the differential and took it into the shop. He confirmed this, and ordered a new rear end. Today they replaced it, and now it is quiet as a mouse.
Ah, ok. I'm driving it 1200 miles to Florida on Saturday. Once I'm there and moved in, I'll take her in. Hopefully it doesn't explode half way there.
Took the Vagon in this morning, had the service writer go for a ride with me. He said he was too busy, initially. I told him I could set at his desk and make Rrrrrr & Wah-wah-wah sounds with my mouth while he typed the symptoms for 15 minutes, or we could go for a 2 minute ride. He got my sense of humor, so out we went. He immediately heard the sound and said, "Yeah. That ain't right".
Got a loaner SRX (with CUE, I'll keep my antiquated system, thank you very much) and got a call from the shop just now. Differential is toast, new one is on the way from Reno. Should have the car back in a couple of days...
Good outcome. Just break it in right! You shall be noise free!
Yeah I'm pleased, just hope they get it done right.
Now that that is out of the way, I have the rocking Recaro & sunroof noise issues to look forward to.
And make sure they're putting in the LSD additive too.
I am glad to hear you were able to go for a ride with a service writer at the dealership and he noticed the sound also. Good news they were able to locate the issue and order a new part for you. Let us know how everything goes, and reach out to us with any other concerns or issues! We can be contacted via private message.
Cadillac Customer Care
Also, I'm impressed, and somewhat amazed that GM has folks like you whose job it is to peruse these forums, and assist their customers. Say what you want, but it's pretty darn impressive to me. I'll post when the car is done, looking forward to getting it back without the noise...
I picked the car up today. Waiting for the fluid additive, new lugs and a new key fob. Thank You for your assistanceOriginally Posted by Cadillac Cust Svc
Are they fixing the chin spoiler?
My V is getting a new rear diff as we speak. Same sort of issue...whining sound under throttle at 50mph. Service manager heard it immediately, said 'you're getting a new one', and then said that it'll eventually happen to that one too. Boo.