CMP Actuator System Performance Diagnostic
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) monitors the performance of the camshaft position (CMP) actuator system by monitoring the calibrated desired position and the actual position of the camshaft through the 4X signal of the CMP sensor. If the difference between the actual and desired position is greater than a calibrated angle for a calibrated amount of time, DTC P0011 will set.