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Discussion Starter · #1 ·
I am new to this site and just bought my first CTS V . I have a 2012 with an automatic and at low speeds turning either direction I get this terrible howl sound from the back of the car. I bought this from an original owner and has been dealer serviced since new. The car is extremely clean and completely bone stock with 67,000 miles. I bought the car out of state and had it shipped to me only to find out I have this problem. The dealer just did a differential service 11,000 miles ago. Any advice would be greatly appreciated.
 

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Try changing the fluid with known correct fluid first, acdelco LS would be my choice. Besides that you'll be looking for a diff unfortunately.
 

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change the fluid, and make sure it has the friction modifier in it. Worst case time for a new diff
 
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First, for some clarity you need to determine if the issue is
  1. a limited-slip noise (known issue, simple fix) OR if it is
  2. a gear set/bearing misalignment/worn gear contact whine (also well known issue, no easy-cheap fix)
(When you say "rear end howl" we associate that with issue 2.)

Symptoms of #1 are noises during low speed turns, usually a growling or popping
#2. A howling noise that occurs at moderate hwy speeds, in straight-line travel and the noise changes or disappears with throttle release and comes back with light throttle (cruising at say 60MPH)

Your issue is likely #1 and it means that at the last fluid change that they did NOT add the friction modifier to the lube. Simple fix--- add the FM (couple ounces) or simply change fluid again and select a lube that specifically includes it e.g. Royal Purple 75W-140
 

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#2 above is a well-documented issue with Gen 2 V's and the fix is costly. But it has nothing to do with low speeds or turning, so you should be good with the proper lube.
 

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Discussion Starter · #6 ·
Well it was 40 degrees this morning, and I made an appointment with the cadillac dealer Monday morning-I’m assuming they have the right lube and additive?
 

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Yes they do HAVE it but you need to make sure to remind the Service Writer that the car requires it. It will appear on your bill as a separate charge most likely.
 

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Well it was 40 degrees this morning, and I made an appointment with the cadillac dealer Monday morning-I’m assuming they have the right lube and additive?
Well, how did it go?


Sent from my iPhone using Tapatalk
 

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Discussion Starter · #10 ·
Dealer said there wasn’t any metal shavings or debris in the fluid, they flushed and refilled with the gm additive and problem solved,,,,,,,for $250
 

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EXCELLENT result! Glad to hear it.
 
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