Conditions for Setting the DTC

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing crankshaft position sensor pulses.

The ECM detects that the starter is commanded ON and the engine has been cranking for more than 4 s without a camshaft position sensor pulse.
The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.
The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1000 engine cycles.