Jason

My 2013 ford c max hybrid sel Makes a humming sound when it hit the gas and when I let go it stops I got it on January 27th 2024 and it stated making the sound since that date and still is don't know what it is and what's causing it and it gets loud if on high way not as much but u can hear it and main roads and hills u hear it more I don't know if that's normal or not plz let me know what you think what it could be I have a appointment at the end of Feb to get it check out