Voltage doesn't change to cam pos actuator?

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4.2 I6 code P1345 and cruise control does not work... I have replaced cam pos sensor, crank pos sensor and cam pos actuator, still have code P1345. I hooked a volt meter to cam pos actuator, got12+ volt immediately at start up. Drove it 30 miles city and highway, the voltage never changed, never dropped or toggled off. Any thoughts?