Our 2015 CRV LX AWD makes a loud grinding noise from the rear end when we back up. Especially going up ur down hill when backing up. Going forward there are no noises. After doing some research online, most of the information talks about the normal cause being the breakdown of the differential fluid and replacing the fluid fixes the problem. We replaced the fluid with the approved Honda fluid and the noise is still there and may be a little louder. This CRV has 26k miles on it. If I try to sell or trade it in, I would lose on the deal due to this noise. I am stuck with a low mileage CRV due to a noise that the dealer cannot explain. The CRV is suppose to be the highest rated for quality and resale but not from what i have experienced. Anyone have other suggestions on this noise? I can't find an official Honda notice but apparently this has been a CRV problem identified for several years! The back up noise is not as loud on flat roads as it is on hills and it is worse when you back up and turn at the same time.