I drive a Skyactiv 2013 Mazda 3 2.0 Liter MT 65,000 miles, and recently bought a 2023 CX-5 NA AT bought new, now at 10,000 miles. Over time I noticed pretty much the same noise with the same characteristics in both vehicles. I get to maybe 45 MPH ish, and I hear a whine that slowly raises in pitch with speed.

Both cars drive perfectly normal. Seems unlikely that it’s an issue since both cars do it. I’ve read a post or two where people took their cars to the dealership and they said it was a normal sound that the alternator makes. Interested to see if anyone else experiences this with their car, or has any thoughts on it.

Thanks for reading, love the subreddit everyone!

  • MonsieurReynard@alien.topBEnglish
    1·
    1 year ago

    If the noise occurs under load and instantly stops when you take the load off, that’s often a sign of something on the belt. Can be a sign of transmission issues too. Actually it occurs to me to wonder if you’re hearing the normal sound of a six speed auto transmission found in both cars? Because the fact that you hear it on both vehicles suggests it isn’t a mechanical problem.

    Just replaced both belts and the tensioner on my 2014 3 at 150k miles. Didn’t really hear any change in sound though.