What is this rattling noise when car put in reverse or drive gear? (2014 Honda CR-V)

Question

I recently bought a used 2014 Honda CR-V. I noticed in my garage today, that there is a strange rattling noise right when I put the car in reverse or drive gear. It is much more pronounced when the car has the AC turned on. I have linked the videos of the noise to this post.

The noise does not exist when the car is put on neutral or park. 
This noise is also does not continue as long when the hood is open, but does still occur.

The car drives fine otherwise and there are no jerks or any weird vibrations or anything of that sort.

Here is a link to the videos I recorded with the hood open and with the hood closed

Ms. D · Accepted Answer

I had the same issue. When I put the car in reverse or when the air condition is on maximum, there is a noisy vibration. I had it checked out by the Honda dealer. The mechanic drove it around and did not feel or hear the vibration. The service guy took me and my husband to the back to see if we could identify the noise. We did and they determined it was the Tensioner. Honda replace it and there is no more vibration, when the vehicle is in reverse or when the ac is on max.

Correct answer by Ms. D on August 22, 2021

What is this rattling noise when car put in reverse or drive gear? (2014 Honda CR-V)

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