This video explains where you can locate the four shift solenoids that are on the inside cover on the side of the transmission for a 2008 Honda Odyssey.
Checkout ericthecarguys solenoid replacement on his daughter's 03 honda element. He tested it using a power probe. You just have to put power to one of the prongs.
Thank you for posting, looking forward for your updates. I have a P9080 code and P9074 . D is flashing and check engine light is on.I changed a linear solenoid, a dual solenoid, 3-rd and 4-th pressure switch and no changes...