DTC P1345: Crankshaft/Camshaft Position Sensor Correlation: Description
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
This Diagnostic Trouble Code (DTC) monitors the crankshaft position (CKP) and the camshaft position (CMP) signals to determine if they are synchronized. If both signals are not observed by the control module within a narrow time window, the Powertrain Control Module (PCM) will determine that an error has occurred.