My car stereo has a high pitch whining noise. How can I fix it? Alpine cdm 7871

check condition of drive belt and check tension of the belt as it may be slipping under load at revs.

A high pitched whine like that indicates a bad bearing. Water pump, power steering pump, accessory belt slipping, alternator bearing, or in the worst case scenerio, Transmission pump.

remove the belt and start the engine ..IF THE NOISE disappear it might be idler bearings that driven by belt but if the noise still there check the pcv valve..

Could be your alternator or a bad idler pulley. Is the transmission good? It may be the tranny or your differential whining.

I assume that you have a 6cyl engine, noise came from both worned secondary timing chain tenssioner shoes, just replace those two and while you have them all apart, also replace main tenssioner and guide, then all noises will go away. Good luck!

check the belt tensioner.

Maybe the alternator is bad. A high pitched whine could mean that the alternator is not working properly.

One can test, by removing the belt to the alternator and running the engine and seeing if the whine goes away.

Have the tranny serviced with fluid change and filter, if noise it still there it is the torque converter . Have the dealer fix it ,and have it on paper with dealer invoice when it is done. Do all this before warranty expires. IT IS NOT USUAL for any car, Toyota included, to have tranny whine!!!!!

you could be low on transmission fluid check that and make sure it registering properly on the dipstick.

The high pitched whine in reverse sounds normal for a honda. Ever honda I have had makes a similar noise while in reverse. The spinning, scraping noise in drive is not normal. You might want to see a mechanic about that.