What does this CEL code mean?

P0012 "A" Camshaft Position - Timing Over-Retarded (Bank 1)

What does this CEL code mean and how do I fix it. Autozone guy cleared it and its been off for about 10 miles now but I suspect it will be back.

 

What year is your vehicle and how many miles? To start, is your oil clean and full?

P0012 TOYOTA Description
The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.

Read more: http://engine-codes.com/p0012_toyota.html#ixzz2IwI4iv8D
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http://www.obd-codes.com/p0012

 

Well it same CEL came back on. Autozone doesn't have a listing for a Oul Control Valve, is there another name for the OCV?