P2647 rocker arm actuator stuck on bank 1 - 2005 Honda Odyssey

you replaced the solenoid but the code refers to the actuator A bank 1--performance problem or actuator stuck off====causes wiring---rocker arm actuator
have it professionally checked and if faulty replaced , then the code will be cancelled

its on engine head

code p 2646 refers to rocker arm actuator A bank 1---performance problem or actuator stuck off=== causes wiring--- rocker arm actuator
discuss the problem with a service dealer shop or an accredited service shop that has experience on your make of vehicle
with rocker arm problems , to stop rotation it may be bottoming out on a valve spring and not letting the cam shaft turn .
talk with a shop for a proper diagnosis and quote

P2645:'A' Rocker Arm Actuator Control Circuit/Open Bank 1 http://www.autocodes.com/p2645.html

P2647: Rocker Arm Oil Pressure Switch Circuit High Voltage http://www.autocodes.com/p2647.html

Not familiar with this particlar vehicle, bt the oil pressure switch is generally located below the heads, where the oil passage is parallel to the cylinder head.

it is the unit attached to the cam shaft that varies the valve timing by moving the cam inside the gear
It is oil pressure operated and electronically controlled
take it to an accredited service center and have the job done professionally

Your going to need a air pressure regulator or better yet if the ECM found fault price it and replace it

1. Start the engine, and let it run for 5 minutes, then turn the ignition switch to LOCK (0).
2. Remove the cylinder head cover.
3. Set the No. 1 piston at top dead center (TDC).
4. Move the intake secondary rocker arm A for the No. 1 cylinder. The secondary rocker arm A should move independently of the secondary rocker arm B.
1. If the intake secondary rocker arm A moves freely, go to step 5.
2. If the intake secondary rocker arm A does not move, remove the secondary rocker arms as an assembly, then check that the pistons in the secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the secondary rocker arms as an assembly, then retest.
3. Repeat step 4 on the remaining intake secondary rocker arms with each piston at TDC. When all the secondary rocker arms pass the test, go to step 6.
4. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4.0 kgf/cm2, 57 psi).
5. Inspect the valve clearance.
6. Install a 10 x 1.0 mm adapter to the inspection hole, then connect the air pressure regulator
5. With the specified air pressure applied, move the intake secondary rocker arm A for the No. 1 cylinder. The secondary rocker arm A and secondary rocker arm B should move together. If the intake secondary rocker arm A does not move, remove the secondary rocker arms as an assembly, and check that the pistons in the secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the secondary rocker arms as an assembly, then retest.

Could be a bad oil pressure sensor on bank one or low oil level ,or incorrect oil and filter.

p2647 is rocker arm actuator A- bank 1 stuck on--- to fix it should be the VTEC oil pressure switch. That switch will be on the cylinder head. Towards the windshield and passenger's side (I think).

Go to www . hondapartsdeals . com {remove the spaces when typing}

Go to parts, enter your car's info. System: Engine Component Vtec Oil control valve. That diagram should help a lot.

Good Luck.