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![]() ![]() Humming noise is wheel bearing, differential if the fluid was never replaced and it got too hot and maybe brakes. Your humming is coming from somewhere else and I suggest you find an indie shop that has some integrity to check it. 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. 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. The 580 is on the non-turbo base systems and has also proved longevity for the pulley system.Īnother thing, I've not heard a CVT ever "hum" or anything near it. Subaru is the only company that has built a CVT to withstand high torque. ![]() The 690 was put behind turbo engines and has withstood heavy torque output. What model do you have? Is it the TR580 or TR690 CVT? 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. 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. 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". Valve body yes, CVT pulleys and belt/chain, no. ![]()
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