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Hello, as i am sure you know, the testing requires a scanner hooked up to follow the dig flowchart. The diag flowchart is below and list possible causes. I wish i could point you to a common problem but can not
maybe this will help
Circuit Description VVT (Variable Valve Timing) System controls the cam pulley phase to adjust the valve timing to the optimize timing.The engine oil pressure controls VVT pulley.OCV (Oil Control Valve) is located on front of the cylinder head and changes the pulley phase by changing the engine oil passage.ECM controls OCV solenoid by PWM signal to adjust the phase to the target.This code detects that a difference of target angle and actual angle larger than a threshold.IMPORTANT: If DTC store caused by OCV sticks by the contamination, the self recovery works in the middle of the normal driving cycle. This is executed to take out the contamination from OCV. This may resolve the OCV stuck problem.Conditions for Setting The DTC
Action Taken When the DTC Sets
IMPORTANT: DTC is stored in memory as an historical data entry. If there is no freeze frame data, inspection is required. If no problems are discovered during inspection, clear the DTC data from memory.