DTC P0337 - CRANKSHAFT POSITION SENSOR CIRCUIT LOW FREQUENCY GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Crankshaft Position (CKP) sensor sends reference signal to VCM to indicate position of crankshaft and engine speed (RPM). VCM uses this information to determine ignition coil, fuel injector and ignition timing.

Conditions for setting DTC

1. Engine speed less than 4000 RPM.
2. MAF at least 5 grams per second.