Code P0012

I purchased a Bluedriver DTC reader and came up with P0012 "A" Camshaft Position-Timing Over Retarded Bank1.
I am having trouble locating a schematic showing me where this is located.

It is also telling me to replace variable camshaft timing (VCT) solenoid. Is this the same as listed above?

Basically the truck has a rough idle and stalls out when the vehicle stops. Also, I have noticed significant engine power loss.