Skip the auto shop - Our mechanics make house calls

Q: when placing gear shifter in reverse I hear a pop/knock.

asked by on

when placing car in reverse I hear a pop/knock.It does not make noise everytime.

My car has 204000 miles.
My car has an automatic transmission.

Hello. A popping / clunking noise when moving in reverse can be caused by many things. Two of the most common causes for those symptoms are worn axles or motor mounts. The axles are the joints that transmit power from the transmission to the wheels. Most axles have a flexible CV joint that allows for a range of movement for the wheel. This joint can wear out over time and cause the symptoms you are experiencing, along with clicking during turns. The same can also be caused by worn engine or transmission mounts. If any mounts are worn they may allow excessive movement of the engine or transmission, which may result in noises when the transmission is put into gear or when during acceleration. The same can also be caused by internal transmission issues, though this is less likely if the noises only appear in reverse. As noises can sometimes be difficult to diagnose, simply due to the amount of moving parts on a vehicle, I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose what may be causing your noises.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Get a quote

What others are asking

Q: What is the most common belt pulley bearing to fail?

Hello. In most cases, a worn or faulty bearing will produce a grinding or high-pitched whine. However, if you believe that a bearing may be the cause of your problem, then it is likely a bearing in one of the...

Q: I start the car when it's cold. It starts normal then almost dies then returns to normal idle. Now it hesitates on acceleration.

Hi there. Check the idle air control valve (IAC) and see if its working. The IAC is designed to make the engine run at idle in all climate conditions. Also, check the mass air flow sensor (MAF) and see if...

Q: Coolant leak despite water pump replacement

It sounds like you have already pinpointed the leak. I suggest having your radiator hose replaced as soon as possible since coolant loss can lead to engine overheating and extensive damage. A technician from your YourMechanic can easily do this...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.