Buzzing sound from rear sliding door when in drive or reverse, door wont latch.

Bring it to a mechanic

Hello, sounds like you have a good diagnostic result that needs to be authorized for repairs. Unfortunately, there is no recall on the vehicle for this concern. Safety issue or not, the vehicle is 8 years old and has no warranty with it any longer, unless you purchased some kind of extended coverage. The cost for repair seems consistent with the type of repair being performed. If you have further questions, feel free to ask, but what I am getting from your query is that you think Honda should be covering this repair or something to that affect, and I would say I do not agree with that assertion.

https://repairpal.com/electric-sliding-door-issues-553