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2007 CTS White Diamond - 1997 Deville Silver Mist
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Discussion Starter #1
Hi Everyone,

I have the 2007 CTS with 1500 miles that had the leaking differential. I brought it into Cadillac this week - it took them a day and a half to fix it. There were a lot of cars ahead of me when I brought my car in (mostly Escallades), so they were probably backed up. Anyway, it was the pinion seal. The car rode perfectly before I had it fixed - just noticed a small leak. So I will just have to make sure that the leak doesn't come back. The service manager said that it won't, so I hope he's right.

I did get a loaner car, but not through the dealership. They contract out with Enterprise, so I got the car through them. You have to fill out paperwork as if you're renting a car, so it is a little inconvenient. They did give me a 2007 Buick Lucerne, so I had a nice car to drive around in.

I had a coupon from the dealership for a complimentary oil change, so I had to bring my car in sometime soon anyway. Hopefully, I won't need anymore service done on the car for a long time.
 

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I would recommend that you keep very good records of your visits to the dealership regarding your differential. The CTS has had issues with the differential. I hope GM resolved it for 07. I hope that the leak is the end of it, but just in case it isn't, your records will help you in the long run.
 

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I'm going in Tuesday for exactly the same leak (06, 7k miles). The last car I had that did this was a 1958 Impala. (I woulda thought they had this 'technology' down by now.) Anyway, GREAT car, the nicest I've ever owned, and no other problems at all. But I will keep records.
 

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2007 CTS White Diamond - 1997 Deville Silver Mist
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Discussion Starter #4
I would recommend that you keep very good records of your visits to the dealership regarding your differential. The CTS has had issues with the differential. I hope GM resolved it for 07. I hope that the leak is the end of it, but just in case it isn't, your records will help you in the long run.
I do keep all records, but Cadillac keeps all the work performed on the car in their computer as well. The car rides perfectly - there was no problem with the differential making noise, etc. I guess if you don't notice the leak and the fluid gets very low, you can burn out the bearings in the differential and that's when you would have problems. I have my own driveway and I noticed the leak immediately and I brought it in for service as soon as I noticed it. Also, it was a very small leak, so very little fluid was lost.
 

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2007 CTS White Diamond - 1997 Deville Silver Mist
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Discussion Starter #5
I'm going in Tuesday for exactly the same leak (06, 7k miles). The last car I had that did this was a 1958 Impala. (I woulda thought they had this 'technology' down by now.) Anyway, GREAT car, the nicest I've ever owned, and no other problems at all. But I will keep records.

It is a great car, isn't it? I couldn't be happier with it. Is Cadillac giving you a loaner vehicle? They provided one for me, so there really was no inconvenice. A loaner is part of the warranty, so if you need a car, they should provide one for you. I was told by the service manager that the repair is not too bad and they're familiar with this problem, so everything should be fine once they make the repair.

How much fluid was your car dropping? Mine was dropping a small puddle about the size of a silver dollar. Really a small leak. I was going to bring my car in for its first oil change at the dealer anyway, so I was due to bring it in. The dealership gave me a complimentary oil change.

One thing I did buy was an extra key. Cadillac only provides 2 sets of keys and I like to have a third one for valet parking , etc. That was pretty costly for a key. It cost $45.

Anyway, good luck with the repair and let us know how everything turns out.
 

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Ya hey, looks like I have the same leaky differential on my 06 CTS (7100km). Noticed a small puddle about a month ago that has been getting bigger but I park on the street in front of my house and assumed it had to be the 97 Volvo that sometimes parks where I do. Whoops, going in to the shop in two days. Will let you know.
 

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2006 CTS 3.6 Black Raven Sport
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I had my 06 in for an oil change a few weeks ago. While it was on the hoist, I checked the diff, and yes it was leeking.

But mine was just weeping from the top vent, not the pinion or axle seals.

I asked to have the fluid changed, but that isn't covered by the 4 year free maintenance. They wanted about $200 to change the fluid.

I had the mechanic pull the fill plug to make sure the diff was'nt low on fluid. It wasn't. It was overfilled by about 1/2 pint or so. So he drained the excess off.

Now I'm just waiting to see how much of a mess it makes. Maybe the excess fluid was causing a build up of pressure that vented out.

I'll be watching it VERY closely.
 

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Forgive my ignorance but re the known differential problem...is there any preventative work that can be done to minimize the chance of occurance?
 

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I took my 06 in for the drippage mentioned above (quarter-sized)(and which I expected from reading this forum), they didn't question me at all, sent me straight to the free Enterprise loaner desk, and I got the car back the next day. It was washed, some trim pieces were adjusted, and I got a coupon for a free State inspection and oil change. In and out in about 15 minutes. You can't beat that. (kudos to Moore Cadillac, Chantilly, VA) Of course, automotive differentials and their seals have been around for, oh, about 100 YEARS and by now they shouldn't leak at all, but they've handled this issue correctly.
 

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Cadillac 3.6 CTS
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Would the dealer fix or do something about the noise without the leak. my 07 CTS is very noisy from the back with no leak observed.
 

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Would the dealer fix or do something about the noise without the leak. my 07 CTS is very noisy from the back with no leak observed.
Wish I could give you a definitive answer, but it's a maybe, maybe not...

Some of these cars have a moaning differential. If it's really bad, they may swap it out and put in a new differential. Some service department reps dig in their collective heels & say the noise not out of the ordinary. Others test, listen, agree & replace. A noisy differential may or may not get worse and/or fail....

You could call Cadillac & complain if the service department blows you off. I've had ours replaced several times. But...replacement may not solve the problem. Each of our replacements has begun to moan within a couple thousand miles... A design flaw that is supposedly corrected with the '08 model...
 
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