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.

Car is making a noise Inspection $94.99 - $114.99 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How Do I Use a Blind Spot Mirror?
If you’ve never used blind spot mirrors (https://www.yourmechanic.com/article/how-to-use-blind-spot-mirrors) on a vehicle you’ve driven, they can be a bit disorienting while getting used to them. The convex shape provides a wider field of view and shows objects, cars, and curbs you...
Transmission over temperature and truck doesn't start.
I have seen this concern with your Jeep Commander before, not only through my own personal experiences, but also from other certified mechanics working on this vehicle. Through some tag team diagnostic skills, we were able to determine that one...
How do I adjust the interior light dimming time?
When you open a door to your vehicle, the interior lights will come on, even if there isn’t a key in the ignition. When you then close the doors, the lights will stay on for a short period of time,...
What does it mean when the exterior alarm sounds for two seconds?
The exterior alarm can sound in a variety of ways to alert you when something is not correct. If the alarm sounds once, for five seconds, then one of two things has occurred: You attempted to lock the doors with...
Car vibrating while driving
Many things can cause a vibration such as the one you are describing. Separated tires, tires out of balance, worn u-joints, broken carrier bearings, out of balance or a bent driveshaft will cause a vibration that is speed related. Some...
Car stopped after rough idle
This is a common symptom of a faulty idle air control module. This module regulates the control of air being mixed with fuel at idle. When this is faulty, it will cause an imbalanced amount of air and fuel to...
Cost for transmission replacement
Re-manufactured transmissions for this vehicle cost in the neighborhood of $3,000, not including installation. Prior to deciding to re-build the car's existing transmission (a good, lower cost option) or replacing it with a re-manufactured unit (a higher cost option), the...
Overheating, white smoke from under the hood, leaking coolant, heater blowing cold air 2007 Saturn Relay
Hi there - from your symptoms, a failed water pump (https://www.yourmechanic.com/question/my-water-pump-leaks-and-shoots-out-water-by-sasha-p), or ruptured coolant hose is the likely cause of the failure you experienced. I recommend a cooling system inspection (https://www.yourmechanic.com/services/coolant-is-leaking-inspection) performed by a mobile, professional mechanic, such as one...
My 98 Dodge neon fuel pump fuse keeps blowing?
If the fuel pump fuse keeps blowing then the most common cause of this the fuel pump in the tank is drawing too many amps and blows the fuse after it overheats. Replace the intank fuel pump and the filter....

Related articles

A Buyer’s Guide to the 2009 Mazda Tribute Hybrid
2009 2009 marked the end of the very short life of the Mazda Tribute Hybrid. All told, the automaker produced fewer than 700 models, and it was ultimately retired well before the Tribute itself ceased production in 2011. For the...
A Buyer’s Guide to the 2012 Honda CR-Z
In In the tradition of the sporty CRX, the CR-Z boasts some of the similar look, without quite the same amount of pep. That’s because the CR-Z is Honda’s eco-friendly offering and a pretty unique one to boot – (as...
The Best Used Cars to Buy If You're a Fisherman
What What do anglers look for, specifically, in their vehicles? Lots of room, plenty of cargo space, and sometimes, the ability to handle rough terrain. Some fishermen also want the option of towing a boat. With that in mind, we...