Q: When going 0-20 mph I hear a knocking noise but over 20 mph no noise

asked by on July 13, 2017

When going 0-20 mph I hear a knocking noise but over 20 mph no noise. It just is knocking when accerlating and pushing on the brake.

Any ideas?

My car has 110000 miles.
My car has an automatic transmission.

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Hi there. Quite often when you hear a knocking sound while accelerating and while braking, it’s caused by a CV joint that is damaged or wheel bearings that are damaged. It is also possible (although unlikely) that a damaged pulley from a serpentine belt or secondary belt is damaged as well. Before you attempt any repairs or take your car to a shop, it would probably be a good idea to have a professional mobile mechanic come to your location and complete a car is making a noise inspection, so they can correctly diagnose this problem first. This can save you a lot of money on ensuring the right repairs are made the first time.

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