Hearing a Whining Noise?
Diagnosis Help and Advice on XC90 AWD System
It had a noise when accelerating when cold, it sounded like someone tapping a pan under the car. My friend found the problem to be the rear output CV shaft was lacking grease 1st from the factory and probably the grease was cooked or dried out due to its location just above the exhaust pipe.
We Took the XC90 to the Dealer. Diagnostics at the Volvo dealer showed “TCM-002F LOCKUP FUNCTION. SLIPPING NOT ENGAGED.”
- Parts: $4936
- Labor: $750
- Tears: 100,000
vegasjetskier » There is a “transfer case” that takes the power from the transmission (which is connected to the engine and also drives the front wheels through driveshafts that have CV joints) and sends it to the rear differential via a driveshaft. If this front-to-back driveshaft is what was removed to make the noise go away (that would be my guess), then it could be the driveshaft itself making the whining noise or some item beyond that. It sounds like the shop determined that the rear differential is bad and wants to install a new one to the tune of about $5K.
The torque converter is in the transmission and usually has a “lockup” function to reduce fuel consumption.
A “limited slip differential” prevents one wheel from spinning a lot faster than the other when it loses traction by directing power to the other wheel. This improves the overall traction of the vehicle and helps it do better off-road or on slippery surfaces. Without it, the spinning wheel would just speed up and all the power would be directed to it instead of pushing the vehicle forward.
OEMVolvoParts » Parts,$4936, Labor, $750
That is extremely high for a parts quote. Seems they are quoting the entire rear end as a fix? If they diagnosed the driveline as making the noise I’m not sure how the rear end fits into this problem. An entire driveline would retail for $1159.67 so how do they get to $4936.00?
The rear tires are controlled by the DEM (differential electronic module) which has quite a few issues itself. If the DEM is not working correctly, your car is now a 2wd, the rear tires will not engage. Maybe they mis-diagnosed the entire rear end as a problem at the same time they diagnosed the driveline.
Depending on where you live and how close another dealer is, I would go for a second opinion. Not all dealers are created equal. I’m pretty confused myself as to what they are replacing/repairing so try to get a better explanation what is in the $4,936.00.
murf » Just hitting 50K miles and I did as I said over a year ago. I changed the tranie fluid every other oil change 10K miles that would be every 5k miles I change my oil. Haven’t had any problems with the trans yet.
I did have one problem that my friend resolved and I think everyone should know about this. It had a noise when accelerating when cold, it sounded like someone tapping a pan under the car. My friend found the problem to be the rear output CV shaft was lacking grease 1st from the factory and probably the grease was cooked or dried out due to its location just above the exhaust pipe.
His resolution was to disassemble the CV joint while still leaving the exhaust in place clean it with a rag, flush it with brake clean and repack it with grease. This PM was performed at about 30k miles and I don’t hear a sound from it. What a cheap fix apposed to the dealer’s solution of replacing the output shaft part was 800.00 us + labor?
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Hi,
I have a Volvo xc90 suv currently am having a hard start problem believe to come from bad fuel.
have tried drain the tank and flushing, cleaning the injectors. Access to the drain the tank could locate please advise.