Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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 camshaft position (CMP) sensor pulses.

The ECM detects that the engine is running, but receives less than 53 or more than 63 CKP sensor pulses, during each engine revolution, for 8 of 10 engine revolutions.
The ECM detects that the engine is running, but more than 25 crankshaft resyncs have occurred within 20 seconds.
The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 second.