Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects an open, a short to ground, or a short to voltage in the high control circuit of the CMP actuator solenoid, or an open in the low reference circuit of the CMP actuator solenoid for more than 0.25 second.