driving down highway, truck began making pingin/knocking sound, pulled off, engine shut off, checked oil, 1/2 full, added some oil, drove 3 mi with knock, checked codes getting p0014, please help, knock/pinging is with rpms, and not really present at idle

I would recommend replacing the Camshaft Actuator Solenoid, and changing the oil & filter...P0014 CHEVROLET - Exhaust Camshaft Position System Performance... Possible causes - Dirty Oil - Low engine oil level - Faulty Exhaust Camshaft Position Actuator Solenoid - Exhaust Camshaft Position Actuator Solenoid harness is open or shorted - Exhaust Camshaft Position Actuator Solenoid circuit poor electrical connection - Faulty Engine Control Module (ECM)........The Camshaft Position (CMP) actuator is attached to each camshaft and is hydraulically operated in order to change the angle of the camshaft relative to Crankshaft Position (CKP). The CMP actuator solenoid is controlled by the control module. The control module sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to a CMP actuator. The CMP actuator can change the camshaft angle a maximum of 25 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.

Same thing happened to me. I replaced the exhaust camshaft actuator solenoid and my motor knocks with RPMS still. All 3 screens were still on the solenoid but the one in the middle had metal shavings. I changed the oil with the solenoid as well. No knock with idle but loud knock with RPM. Could it be the manifold gasket or is it the camshaft? 2010 GMC canyon