You can test the ground circuit to be sure it provides a good ground. Less than 5ohms resistance.
You can test the control circuit to make sure it isn't shorted to power by using a test light (don't use a multimeter, the circuit has a bias voltage for diagnostic purposes present.)
You can inspect the terminals of the connector and the wiring, being sure to notice any thin or lighter colored areas of insulation, indicative of broken conductor inside the insulation. An electrically complete, but high resistance circuit can set this code without triggering the P0010 one would expect.
Beyond these tests, you'll either need to physically inspect the timing, or have access to a scan tool with the "desired" and "actual" cam timing parameters or both in order to properly diagnose the issue. (Assuming your engine is free of sludge, oil pressure is ok, and oil level and condition are ok)
This is typically a mechanical.issue. sludge, failed sprocket actuator, slipped timing.