Transmission gears not engaging?

The first thing I would do is check the fluid condition and service the fluid to see if it is dirty or burnt. Please go over these guides to help us fix the problem:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Fluid Types

Transmission Fluid

Fluid Type .................... Honda ATF DW-1 (ATF)

ATF Z1 has been replaced by ATF DW-1 (Honda Service News Nov 2010). Using a non-Honda ATF can affect shift quality.
Capacities
Transmission Fluid

Drain and Refill .................... 2.5L

Overhaul .................... 6.1L

We should run the codes as well

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.