| 2004-2007 Cadillac CTS-V General Discussion Discuss everything about the first generation Cadillac CTS-V that does NOT fall into either the Performance or Appearance Modification category. | Cadillac Forums: High Pitched Whine (Not Rear End) 
01-09-07, 01:03 PM
| | Cadillac Owners Connoisseur  | | Join Date: Feb 2004 Location: Conroe, Texas Age: 41 | |  High Pitched Whine (Not Rear End)
My car is driving me crazy. Got it back last week after having the thermostat housing TSB done and battery replaced I hoped it would take care of my noise..............but it didn't. I have a high pitched whine (like alternator whine in a stereo or fuel pump whine) that comes and goes as it pleases. Some days it won't even do it and other days it will do it for thirty minutes at a time. It sounds like it is coming from the right rear of the car inside but I can't really tell. My new rear end only has about 700 miles on it and is quiet as can be. My car made the same noise before the rear was replaced. I'm also loosing tire pressure on the right rear tire slowly and sometimes me tire pressure reads 0. Could it be possible my sensor is loose inside my wheel and could be making this noise???? Any ideas guys????? I'm stumped  .
Shane
Last edited by ssmith100; 01-09-07 at 02:45 PM.
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01-09-07, 01:08 PM
| | Cadillac Owners Connoisseur | | | | | Re: High Pitched Whine (Not Rear End)
Low Power Steering Fluid!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!! |
01-09-07, 01:19 PM
| | Cadillac Owners Enthusiast Cadillac(s): 04CTSVsc | | Join Date: May 2005 Location: getting shacked Ocean City, MD | | | Re: High Pitched Whine (Not Rear End)
Wife in trunk?lol
Is your car running okay--not fuel starved or anything? |
01-09-07, 01:22 PM
|  | How YOU doin? Cadillac(s): 2007 SRX (Previously 04 CTS-V) | | Join Date: Dec 2004 Location: Over here. No, not there. | | | Re: High Pitched Whine (Not Rear End)
If you don't have a nail in the tire, the pressure loss is probably due to a bad seal on the TPM. I had that happen once, but there's no noise associated with it. Spray some soapy water on the valve stem, and if there's a leak it'll bubble up.
I'm inclined to go with the power steering diagnosis for the whine. Check the fluid, and make sure if you top it off yourself that you use the correct fluid.
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01-09-07, 02:43 PM
| | Cadillac Owners Connoisseur | | Join Date: Feb 2004 Location: Conroe, Texas Age: 41 | | | Re: High Pitched Whine (Not Rear End)
Thanks guys. Power steering level is full. First thing I checked when it started about three months ago. Car seems to be running fine........I'm stumped. I had one of the techs that does all the work on my car ride with me and of course it didn't do it. Hopefully whatever it is will fail eventually. I thought it might be a wheel bearing but usually when those start making noise they continue to make noise. This noise comes and goes. Very frustrated.
Shane |
01-09-07, 03:20 PM
|  | Super Mod Cadillac(s): 07 STS-V Platinum | | Join Date: Aug 2003 Location: North Coast, OH Age: 43 | | | Re: High Pitched Whine (Not Rear End)
Quote:
Originally Posted by ssmith100  My car is driving me crazy. Got it back last week after having the thermostat housing TSB done and battery replaced I hoped it would take care of my noise..............but it didn't. I have a high pitched whine (like alternator whine in a stereo or fuel pump whine) that comes and goes as it pleases. Some days it won't even do it and other days it will do it for thirty minutes at a time. It sounds like it is coming from the right rear of the car inside but I can't really tell. My new rear end only has about 700 miles on it and is quiet as can be. My car made the same noise before the rear was replaced. I'm also loosing tire pressure on the right rear tire slowly and sometimes me tire pressure reads 0. Could it be possible my sensor is loose inside my wheel and could be making this noise???? Any ideas guys????? I'm stumped .
Shane | Shane,
I have that exact same noise...doesnt seem to affect driving, but just annoying. Has been happening for last 5K miles. I suspect the rear or the 1/2 shafts....definately not the TPS...
F |
01-09-07, 03:42 PM
| | Cadillac Owners Connoisseur | | Join Date: Feb 2004 Location: Conroe, Texas Age: 41 | | | Re: High Pitched Whine (Not Rear End)
Flo,
I'm pretty sure it isn't the new rear as it was doing it with the old one. I thought hopefully the new rear would take care of the problem, but it didn't. I'm just absolutely stumped at what it could be. It almost sounds more electrical related than drivetrain but the noise does stop when I come to a complete stop. It will fluctuate in volume till it reaches a certain speed and then just stays at that "tone" whether I'm going 70 or 100. As I decrease in speed the tone will change and eventually stop when I come to a stop. As soon as I accelerate to about 10 mph it starts, or doesn't start back. Totally frustrated.
Shane |
01-09-07, 04:10 PM
|  | Cadillac Owners Member Cadillac(s): 05 maggied CTS-V, 03 maggied Z06 | | | | | Re: High Pitched Whine (Not Rear End)
Fuel pump is on that side, but I don't see how movement of the car would make it whine. 
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01-09-07, 05:40 PM
| | Super Mod Cadillac(s): 07 STS-V Platinum | | Join Date: Aug 2003 Location: North Coast, OH Age: 43 | | | Re: High Pitched Whine (Not Rear End)
Quote:
Originally Posted by ssmith100 Flo,
I'm pretty sure it isn't the new rear as it was doing it with the old one. I thought hopefully the new rear would take care of the problem, but it didn't. I'm just absolutely stumped at what it could be. It almost sounds more electrical related than drivetrain but the noise does stop when I come to a complete stop. It will fluctuate in volume till it reaches a certain speed and then just stays at that "tone" whether I'm going 70 or 100. As I decrease in speed the tone will change and eventually stop when I come to a stop. As soon as I accelerate to about 10 mph it starts, or doesn't start back. Totally frustrated.
Shane |
Exact same thing....no question about it. At times it even "warbles" a bit until up to a constant tone....sometimes at highway speeds it will stop abruptly...its really wierd.
F |
01-09-07, 05:53 PM
| | Cadillac Owners Connoisseur | | Join Date: Feb 2004 Location: Conroe, Texas Age: 41 | | | Re: High Pitched Whine (Not Rear End)
Heavy,
Is the pump in the tank or external???? At idle is the pressure a lot lower than during acceleration ????? To me that's what it sounds like but it doesn't do it all the time.
Shane |
01-09-07, 05:56 PM
| | Cadillac Owners Connoisseur | | Join Date: Feb 2004 Location: Conroe, Texas Age: 41 | | | Re: High Pitched Whine (Not Rear End)
Flo,
That sounds like it. I wonder how come nobody else has had this complaint??? People also may think that this noise is the rear end whining when it maybe this noise. Sure wish you could figure it out 
Shane |
01-09-07, 06:09 PM
|  | SUPERBOWL Champions. Just saying. Cadillac(s): 560 HP Blitzburgh Edition CTS-V | | Join Date: Sep 2004 Location: Steeler Nation | | | Re: High Pitched Whine (Not Rear End)
Could be the fuel pump, but it doesn't make sense that the noise goes away when you come to a stop (unless you turn off the ignition). I'm no expert on the fuel pump in our car but in general on a direct injection system they run at a constant rate and simply push gas to the FI, which does most of the work.
If Shane is maggied (and I think he is) I'd say maybe the booster pump. But Florian's not maggied and has the exact same sound? 
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01-09-07, 06:11 PM
| | SUPERBOWL Champions. Just saying. Cadillac(s): 560 HP Blitzburgh Edition CTS-V | | Join Date: Sep 2004 Location: Steeler Nation | | | Re: High Pitched Whine (Not Rear End)
Okay, the F l o r i a n sheep thing is starting to lose its novelty... |
01-09-07, 06:16 PM
| | Super Mod Cadillac(s): 07 STS-V Platinum | | Join Date: Aug 2003 Location: North Coast, OH Age: 43 | | | Re: High Pitched Whine (Not Rear End)
Quote:
Originally Posted by lawfive Okay, the F l o r i a n sheep thing is starting to lose its novelty... | L5, roger that...I gotta talk to Urby...hes the culprit.
F |
01-09-07, 06:17 PM
| | Super Mod Cadillac(s): 07 STS-V Platinum | | Join Date: Aug 2003 Location: North Coast, OH Age: 43 | | | Re: High Pitched Whine (Not Rear End)
Quote:
Originally Posted by lawfive Could be the fuel pump, but it doesn't make sense that the noise goes away when you come to a stop (unless you turn off the ignition). I'm no expert on the fuel pump in our car but in general on a direct injection system they run at a constant rate and simply push gas to the FI, which does most of the work.
If Shane is maggied (and I think he is) I'd say maybe the booster pump. But Floria-n's not maggied and has the exact same sound? |
Ive been scratchin my head for over 5K miles trying to figure this one out.
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