Recently purchased a 2004 CTS with automatic transmission - 44K miles. Noticed an occassional soft "whine" when coasting at lower speeds (30 - 45 MPH for example). Suspect noise to be coming from transmission. Briefly shifting to N will remove the noise. Shifting back to D and continuing to coast, the noise may or may not return.
Accelerating tends to remove the noise too.
Otherwise, no other symptoms noticed and driveability is fine.
Hey Gary, take your car and get the transmission fluid and filter changed immediately... you will be glad you did...(expensive lessons speaking!!!)
SOURCE: Transmission problems
First off, I'd try changing the fluid and filter in the transmission. I know a lot of cars claim "lifetime fluid" - it's BS. Believe me, even the lifetime fluids get very dirty. Change out the fluid and filter, and you could even add some Lucas stabilizer to it - that may well help cure the problems.
When the transmission goes completely, it may lock up the drive wheels, sending you into a careening slide, or it may kick out to neutral and coast to a stop. It's also possible that if it flat-out blows, it could fragment inside and you'd hear what sounds like bolts in a blender as you coast to a standstill.
Discounting the transmission blowing up, and just looking at driving in a drive gear other than overdrive, you're looking at more heat in the transmission due to the higher gear RPM, shorter fluid life, possible slippage of the bands down the road due to heat, and of course decreased gas mileage due to the engine running at higher RPM.
SOURCE: traction active
YOU MUST TURN THE TRACTION SWITCH OFF THE BUTTOM IS ON THE RIGHT SIDE OFF THE CENTER CONSOLE HOLD THAT BUTTON FOR A FEW SEC AND LOOK AT THE DISPLAY IT SHOULD SAY TRACTION OFF OR STABALIZE SYSTEM OFF TRY THAT OUT.
SOURCE: what are the functions of Resume &Coast buttons in steering wheel
If set at a specific speed and you have to slow down by hitting the brakes, The brakes turn off the cruise control. Pressing resume automatically turns the cruise control back on and accelerates to the previous speed setting. You can also use it to accelerate and by releasing it the new speed will be set.
SOURCE: Service Engine Soon
Yu might wanna scan the car for possible error codes.
Resources are available at:-
http://www.troublecodes.net/cadillac/
or
http://www.troublecodes.net/cadillac/cadbrom.shtml
But I feel the fuel pump located in the fuel tank beneath the back seat and the fuel filter located in the hood are likely problem.
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have you checked the fluid level?
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