As this seems to happen when the rear end is under load, it does sound like a CV axle problem, can you tell which side it is coming from?
Luckily, they are fairly easily checked/replaced. Why wouldn't they be covered by the dealer warranty?

 

Thanks for the response, we can't tell which side it is coming from, it kind of sounds like the entire rear end, which is why we thought it could be the diff. So possibly both?

I did a google search on whether they are usually covered and read that some warranties consider them to be wear items and don't cover them. I just tend to assume the worst when it comes to dealerships lol.

How would I check them? Give them a good shake and see if theres play?

 

Jack up the rear, remove the wheels and check for torn boots and any play.
This is from the Gen3 manual, I'm sure Gen4 is the same? Seems very complicated but this is for inspecting and re-building.

Honda CR-V - Rear Driveshaft - Driveline/Axle

www.hcrv.net

Good luck with this.

 

Thanks for the info, I'll have to take a look to see if there is a simpler way just to inspect, as disassembly would be a lot to do if the problem is not the CV axles.

 

are the back plates and rotors rusty?

 

The rotors and pads in the rear are brand new, as they were replaced by the dealership however the dust covers on at least one side is in horrendous shape. I don't think its rubbing but thats a good point maybe I should inspect them deeper. Have any specific insight on those? the sound is not occurring while using the brakes.

 

One method of determining which side of the vehicle is producing the noise is to drive near a building wall - something to bounce the noise off of as you drive past. Turn the radio & A/C fan off with all the windows fully open at a speed which replicates the sound.

Have someone sit in the rear seat on the side next to the wall in order to hear the sound, switching sides as needed.

Drive one way in this manner, then drive the same route in the opposite direction.

Some gated residential communities have substantial walls around them. They would work just as well.

Good luck. Keep us posted.

 

Good point, unfortunately its difficult to reproduce the sound. It isn't consistent and we don't quite know how to get it to activate, it seems like we have to be sharply turning while under load or going uphill over really bad roads.

I will take your idea of sitting in the rear seat and maybe take it further by sitting in the trunk!

Thanks for your insight. I'll keep everyone posted as soon as I detect whats wrong.

 

Back plate check grab it and shake it check for loose, if you doing it with wheels on poke them with a long rod /screwdriver. Push them away from the rotors