DTC P0335: Crankshaft Position Sensor Circuit: Description
WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Crankshaft Position (CKP) sensor signal indicates crankshaft speed and position. CKP sensor is connected directly to Powertrain Control Module (PCM), and consists of a 12-volt reference circuit, low reference circuit, and CKP sensor signal circuit.