Conditions for Setting the DTC
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects an open, 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.