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Discussion Starter #1
I have an 08 CTS4. I've loved it, no issues.

3 weeks ago I was driving, and got up to about 20 mph, and it started making a loud sound and vibrating... The best way I can describe the sound was like a baseball card stuck in bicycle spokes... But very loud. And it sounded like it was coming from directly below the gearbox. The gearbox was vibrating badly as well.

So the dealer has had it since then. They said there's a series of bolts that is under there (close to the rear axle, they said), and one of them was completely missing, and the others were very loose.

The problem is... Those bolts are apparently on backorder with GM. So here I am, 3 weeks later, and GM's in bankruptcy, and I still don't even have an ETA on these bolts needed to fix my car.

My worry is that these suppliers aren't in a rush to get GM any parts right now because they're worried about getting paid. And the dealer hasn't given me ANY info.

Does anyone have any suggestions? I've asked why they can't use some bolts out of one of the cars in inventory... They pretty much laughed at me.

I'm just worried that I'm stuck in a potentially never ending situation here, and feel like I've got no recourse at all... Meanwhile I'm not driving the car I'm paying for... For close to a month now.

Thoughts?
 

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2008 CTS 3.6L DI RWD, GMPP new engine 11/2013
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Sorry to hear of your problem.

My worry is that these suppliers aren't in a rush to get GM any parts right now because they're worried about getting paid. And the dealer hasn't given me ANY info.
GM's Press Release dated June 1, 2009, says, in part http://media.gm.com/servlet/GatewayServlet?target=http://image.emerald.gm.com/gmnews/viewmonthlyreleasedetail.do?domain=3&docid=54694:

"General Motors Corporation today reported that it has received U.S. Bankruptcy Court approval to continue honoring all vehicle warranty programs and dealer incentive plans. This and other Court orders today enable GM to assure consumers that warranty coverage on GM vehicles will continue without interruption, whether they already own a GM vehicle or intend to buy a new one; that genuine GM parts will be supplied; and that GM-trained Goodwrench specialists will perform all services.

The Court also granted approval for GM to access a new approximately $33.3 billion debtor-in-possession (DIP) financing facility from the U.S. Treasury and the Canadian and Ontario governments. The court authorized GM to use up to $15 billion of the facility on an interim basis pending a final order approving the full facility. This credit facility will be used, among other things, for the company’s normal liquidity requirements, including employee wages, healthcare benefits, supplier payments, and other operating expenses.
  • Pay essential suppliers and logistics providers for goods and services provided before and after the company's court filings
  • Pay all non-U.S. suppliers to GM Corporation and its U.S. subsidiaries."
Now that the money is flowing, back-ordered supplier parts should too...well, let's hope so.
 

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05 V6 SRX4 - All options minus UV+; 08 DI CTS4 minus UV,Wood
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i have this same exact issue...i get a "grinding"; vibrating; card between spokes type of sound between 30-60km...they changed the tranny and still no change...i keep on telling them i could feel it below the gearbox and towards the front of the car the vibration, grinding, card sound can even be felt near my foot and accelerator pedal. No word from caddy yet and dealer wont do anything else...
 

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05 V6 SRX4 - All options minus UV+; 08 DI CTS4 minus UV,Wood
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come to think of it, they also gave me a "bolt" reason and referred to the rear of the car. That made no sense to me and still doesn't.
 

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Discussion Starter #5
i have this same exact issue...i get a "grinding"; vibrating; card between spokes type of sound between 30-60km...they changed the tranny and still no change...i keep on telling them i could feel it below the gearbox and towards the front of the car the vibration, grinding, card sound can even be felt near my foot and accelerator pedal. No word from caddy yet and dealer wont do anything else...
Ooooh. That scares me a bit.

Did they replace the tranny right away, or did they start off with finding the same issue they found with mine?

Are you driving with the issue? With mine, there's no way you could drive. It's very loud, and it's obvious you'd be tearing SOMETHING up if you drove with it.
 

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2014 SRX Premium w/20" chrome
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The problem is... Those bolts are apparently on backorder with GM. So here I am, 3 weeks later,given me ANY info.

Does anyone have any suggestions? I've asked why they can't use some bolts out of one of the cars in inventory... They pretty much laughed at me.

I'm just worried that I'm stuck in a potentially never ending situation here, and feel like I've got no recourse at all... Meanwhile I'm not driving the car I'm paying for... For close to a month now.

Thoughts?

I can't say for sure but, those bolts are probably not proprietary for the CTS Cadillac. Ask the service manager to give you one of the bolts. You can probably go to NAPA and get them yourself. Your car is sitting for repairs for a month with no end in sight. The Cadillac dealer is required to order replacement parts from GM. Ask him if you get the bolts, will he use them. It will cost you a few bucks, 'till you get reimbursed if you pursue that route, but you'll at least get your car back, hopefully.

Just a thought.
Good Luck
 

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05 V6 SRX4 - All options minus UV+; 08 DI CTS4 minus UV,Wood
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well technically, i can still drive, the grinding noise annoying...can be felt, and i dont think its getting any better...

i really am fed up, just sent out a letter to my dealership, Cadillac supplier in Switzerland, and Cadillac Europe.

theyre doing jack about this and i did not pay 87k for a car that rattles and makes noises, really worrying and embarrassing.
 

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Previous: '08 CTS4, '09 CTS, '11 CTS4, all Premium models. No longer own a Cadillac.
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Just an FYI re a similar problem I experienced on my CTS...

When I took delivery of my '08 CTS4 (Oct. 1/07), I discovered that on each occasion of medium-to-heavy acceleration there was a loud vibration/thumping sound coming up from the driveline tunnel (center console) area.. probably not unlike the loud sounds & vibrations that have been described in this thread. It was initially thought (by dealer service and GM Tech) that the torque-induced vibration/thumping issue on my CTS4 was being caused by intermittent contact between the propshafts (i.e. either the front or rear propshaft) and the underside of the driveline tunnel. It was initially envisioned that the fix for my car would be to add a couple of (J-clip type) 6 mm shims at the support bracket where the front & rear propshafts come together (which is also the location of the driveline's 'CV Joint'). Adding 6 mm shims to this support bracket would have the effect of lowering the rear propshaft by 6 mm, hopefully eliminating any untoward torque-induced contact between propshaft and driveline tunnel. (It was explained to me that the propshafts can (and will) rotate in a considerable non-concentric [i.e. eccentrically orbital] manner whenever a high amount of torque is introduced in the driveline).
It turned out that propshaft-to-driveline tunnel contact was not the problem on my CTS4; the torque induced vibration/thumping issue on my car was caused by the AWD Transfer Case intermittently 'grounding out' on an underside hard point on the vehicle. The fix was to shim the transfer case crossmember down 1/8" (3 mm). Problem solved.

The issue forum members are describing in this thread appears to be related to loose and/or missing bolts at one of two locations:
1. Where the front and rear propshafts come together (i.e. the CV Joint area, at the tail end of the front propshaft), or...
2. Where the tail end of the rear propshaft connects to the differential.
Obviously.. loose or missing bolts at either of the above locations would cause a lot of vibration, particularly at certain vehicle speeds (within a certain range of propshaft rpm). Serious driveline failure would be the next result if the car continued to be driven in that condition.
It is extremely odd that the required bolts would be on back-order for so long. They must be very special bolts. Perhaps there's more to the story than meets the eye here. Maybe they've also ordered a new front or rear propshaft, on account of an out-of-balance / out-of-tolerance propshaft situation. (I'm just thinking out loud here).

Good luck in getting this problem sorted out. Please keep us posted on events if/when they occur.

Cheers,
RAB.
 

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08 Cadillac CTS AWD 3.6DI
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@da_thrilla were are you from? My dealer is "Auto Iten Sihlbrugg" they normaly find every problem in a short time. And the replacement vehicle is free during the warranty work.
 

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05 V6 SRX4 - All options minus UV+; 08 DI CTS4 minus UV,Wood
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Im in Geneva, Grimm Sud is my garage. I get ford Ka's as replacement cars :banghead:

@ RAB, you seem to be describing something very similar to my situation. I get the "grounding" sound when i accelerate between 30-60km/h.

Is there a particular TSB on this? Or would there be a more technical description so that I can show this to my dealer?

thanks again for your inputs.
 

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RAB, you seem to be describing something very similar to my situation. I get the "grounding" sound when i accelerate between 30-60km/h.
Is there a particular TSB on this? Or would there be a more technical description so that I can show this to my dealer?
thanks again for your inputs.
da_thrilla, I am not aware of the specific TSB that speaks about the AWD transfer case grounding out to the tunnel, as what was occurring on my CTS4 from day 1. As mentioned, the vibration (i.e. transfer case grounding out) would occur at moments of high(er) torque on the driveline. It would occur anywhere between speeds of 0 and say 60 km/h, but particularly at lower speeds while accelerating aggressively while at the same time turning (for example.. launching into a 90 degree turn from a standstill at a city intersection). Note that the problem would begin occurring only after the vehicle (i.e. engine/drivetrain) would reach full/normal operating temperature. It would not occur when everything was 'cold', during the first few minutes of vehicle running after a cold engine start.

For your info.. below is a link to a .gif file I have posted at photobucket. The file is a scan/photo of the dealership's service department shop notes provided to me after the repair of my CTS4.



With regard to the other item I spoke about (i.e. rear propshaft making contact with tunnel when driveline is in high torque), below is an excerpt of an email I had sent to the dealer prior to them discovering the true cause of the vibration problem on my CTS4. By the way.. the info provided in my note to the dealer came from a Michigan-based GM engineer specializing in transfer case integration, who was assisting me with the issue (after his reading one of my posts in this forum).

... regarding the vibration/noise issue on my '08 CTS4 ...
The propshaft shims (p/n 25708831) to be ordered for my vehicle are 6mm in thickness, and are shaped like a J Clip. The mod application calls for a total of two (2) shims to be applied, one for each side of the support for the rear propshaft. The purpose of the shims is to lower the rear propshaft by 6mm. GM Engineering have advised that extremes of vehicle manufacturing tolerances can result... (on a small percentage of AWD CTS's)... in a section of the rear propshaft making contact with the underside of the tunnel, when the driveline is in high torque. The existence of high torque on the driveline causes the propshaft to rotate in a non-concentric / orbital manner, which can result in the propshaft making momentary/intermittent contact with the tunnel.
It was also mentioned that contact/wear marks from the propshaft hitting the tunnel could be somewhat difficult to see, particularly if the eyes aren't trained on the exact area of contact.


Finally.. below is a link to another image I've posted at photobucket. This image/drawing depicts some driveline detail (principally the propshafts) on the CTS4. The drawing provides a better idea of what I've been talking about / referring to.



Hope the above provides at least some help. Keep us posted as to what they find, what is going on at the dealer, etc. Good luck.

Cheers,
RAB.
 

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05 V6 SRX4 - All options minus UV+; 08 DI CTS4 minus UV,Wood
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Your the best RAB, really appreciate going through the trouble and posting the above!

I have both of what you said: The grounding when doing 90 degree turns at a standstill and the driveline issue. Interestingly enough, mines also appear only after the car has warmed up.

Ill give this a go @ the dealer and head mechanic.

Thanks again!
 

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Your the best RAB, really appreciate going through the trouble and posting the above!
I have both of what you said: The grounding when doing 90 degree turns at a standstill and the driveline issue. Interestingly enough, mines also appear only after the car has warmed up.
Ill give this a go @ the dealer and head mechanic.
Thanks again!
No trouble at all, da_thrilla. :thumbsup: Glad to be of help.
Sounds like your CTS4 could have one, perhaps both issues I described.
Hopefully your dealer will check it out asap, and get it all sorted.
 
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