Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The PCM detects that the engine has been cranking for more than 10 seconds without a CMP sensor signal.
OR
The PCM detects that when the engine is running, more than 6 CKP sensor low resolution reference signals, generated by the PCM, have occurred for every one CMP sensor signal.