2002 Outback LL Bean with 6 cylinder - there is a squealing noise at low rpms. I can tell it is coming from the drivetrain or somewhere underneath the car. When I accelerate, it goes away. The noise does not change with braking, or steering.
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You have a bad rear hub bearing.It at times starts as a low humming sound,then will increase to a screeching sound..you can jack the car up and have both rear wheels off the ground palce your hands at 12 and 6 pm and try to check for loseness.also if you have a creeper,just to eliminate a bad carrier bearing you can check the axle near the differential by checking it for play also.But I am leaning very much towrds the hub bearing.I have changed several of these...
Mine did that off and on for a month with no other problems then it started making a loud suction noise and the check engine light came on. I took it to the dealer and they said the "oil separator" needed to be replaced. After the repair I never heard the squealing again.
Check the belts for slippage and wear. If the tension is not correct, the belts will slip and create a "squealing" noise...moreso at higher rpms or on acceleration as you mentioned....That is the most common cause for a "squeel". I would check that first. Good luck...i hope this helps fixya up.
If the squealing changes in pitch with the speed of the motor it is likely the belt squealing. While the belt is removed, check the tensioner and other pulleys for unusual noise when spinning them by hand.
the shift to d2 light comes on when batt. voltage gets low enough that all of the sytems can not function properly. the noise is your bel slipping, your battery looses charge and shift to d2 light comes on to tell you to leave trans in drive 2 so it dose not have to use batt voltage to shift. replace your belt and tensioner if your alternator is ok.