I agree entirely with this response. My 2011 OB has 160K miles on it now, but at 120K I started having intermittent "gear ratio" problems. The engine RPM would run up as though I had manually shifted to a lower ratio in the CVT. The dealer thought valve body, but the problem came back. After several tries at a fix, they found an intermittent wire connection; replaced it and all good since then. And the dealer did not charge me full price for the valve body because that wasn't the problem.I'm not buying it. That CVT is not bad at 104k miles. And it is not common for a CVT to fail. Valve body yes, CVT pulleys and belt/chain, no. The dealers were changing out CVT units as a whole early on when issues first arose and the units sent back to Subaru for "autopsy". Subaru found that the pulleys and belts/chains were in great shape and that the issue was the valve body which allowed for air to get trapped and affect flow and pressure, along with premature failure of solenoids, mainly the TCC solenoid. All this was fixed with a new design valve body and the information was forwarded to the dealers to STOP replacing CVTs and only deal with the valve body or wiring harness.
What model do you have? Is it the TR580 or TR690 CVT?
The 690 was put behind turbo engines and has withstood heavy torque output. Subaru is the only company that has built a CVT to withstand high torque. The 580 is on the non-turbo base systems and has also proved longevity for the pulley system.
The dealer is FOS.
Another thing, I've not heard a CVT ever "hum" or anything near it. If the belt/chain has worn the pulleys, due to shite fluid in the CVT or a leak that was ignored, possibly a valve body issue that was ignored, it would make a loud grinding sound, as in metal to metal, the gear ratios would be all F'd up, and the AT Temp light would be flashing or on along with the other VDC related system lights. It would set ratio codes for the CVT and faults due to management of the VDC system as a whole due to a CVT fault.
Your humming is coming from somewhere else and I suggest you find an indie shop that has some integrity to check it.
Humming noise is wheel bearing, differential if the fluid was never replaced and it got too hot and maybe brakes. And on the brakes, I've not seen an Outback, Legacy, Forester, or Impreza of this gen type that needed brake work prior to 125k miles, and that is when they are down to about 3 mm friction or less left on the pad. If you drive a lot of highway and not stop and go city then the car should have went 150k or so. I think they BS'd you on the brake work as well.
The percentage of failed CVTs, as far as I have seen, is nil. I see a lot of Subies with CVTs, hundreds a year, and all of them that had CVT issues with exception to 2 have been valve body issues. The other two was a harness problem and then a torque converter issue that was due to driving the car with a bad VB and long overdue fluid replacement; it was at about 130k miles. After the latter was repaired with a new VB and torque converter the CVT returned to normal operation without issues. I believe a high majority of the CVT replacements are BS. My shop has never changed one.
I have a 2011 Outback with a TR690 that recently flipped 200k miles. It has the original CVT that has had it's VB changed once. No issues with it at all. I have several customers with Outbacks with both CVT types and are they over 150k and problem free.
Stop blaming Subaru and put it where it's deserved - the dealership service departments that use fear to sell unnecessary repairs.
If you want a car with a bad CVT design buy a Ford or Nissan.
A humming noise is gear whine or bearing noise. I'd look at differentials or CV joints.