Conditions for Setting the DTC

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The ECM detects that the starter is commanded ON and the engine has been cranking for greater than 4 s without a crankshaft position sensor pulse.
The ECM detects that the engine is running and the starter is not engaged and no crankshaft position sensor pulse for greater than 0.3 seconds.
The ECM detects that the engine is running, but has not received a crankshaft position sensor pulse for 2 of 10 engine cycles.