I was cruising the other day and out of no where my car CEL came on and threw code 21. I checked and it says vtec solenoid, but problem is the car is still engaging in vtec. Anyone got a clue? I reset the ecu and checked wires on dash harness and engine harness, but everything looks normal. I also reset my ecu a few times, but didn't help.

code 21
92-95 Civic
93-95 Prelude
94+ Integra VTEC Solenoid Valve defective circuit or unplugged / defective solenoid valve
* invalid code for non-VTEC engine
** invalid for V6 engine