I am at my wits end with this 2.4 Vtec Engine. Last week the CEL came on and my code reader produced Error Code P2646 Rocker Arm Actuator A-Bank 1 Perf Stuck Off. After Googling several sites on the internet I ordered a brand new Honda Vtec Spool Valve Unit Part # 15810-RAA-A03. I replaced it and found the old unit to have a very clogged up filter screen. I also removed and replaced the VTC Filter Screen on the front of the engine by the serpentine belt tensioner. It was also clogged up pretty good. I cleaned the passage way good and assembled everything back to normal. I cleared the Error Code from the car with my Actron OBDII unit. Oil level in the engine is normal. My son took the car out this afternoon for a short drive and the darn CEL has come back on again. I do not know what more could be wrong. I change the oil faithfully every 5K miles using Valvoline MaxLife 5W-20 and I have always used a Fram Extra-Guard Oil Filter. I have owned the vehicle since it was new. I do not understand how the engine can build up so much crud to block those screens like it did.

Update as of Friday 20/28/20. Today I removed, cleaned and electrically tested the VTC Oil Control Valve Unit on the passenger side of the valve head. One of the three screens was fairly clogged up. Valve unit cleaned up good and the solenoid unit is functioning when voltage is applied to it. I put it back into the cylinder head and reconnected the electrical socket. I just completely drained all the engine oil and replaced it with Mobil 1, using a brand new Fram PH7317 Oil Filter. I reset the Error Code again and took it for a test drive. As soon as I hit 3000 RPM on the tach the CEL light came back on and the car starts to buck again under load. Can anyone help advise me?

One more thing: WHen the DTC P2646 is reading out, the Cruise Control with not set to a speed. The Cruise Control Light is on but the unit will not set and hold a speed on the highway.